diff --git a/example_data/type_chart.json b/data/type_effectiveness.json
similarity index 100%
rename from example_data/type_chart.json
rename to data/type_effectiveness.json
diff --git a/data/type_effectiveness_generation-i.json b/data/type_effectiveness_generation-i.json
new file mode 100644
index 0000000..682ccec
--- /dev/null
+++ b/data/type_effectiveness_generation-i.json
@@ -0,0 +1,494 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-i"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-i"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-ii.json b/data/type_effectiveness_generation-ii.json
new file mode 100644
index 0000000..905e6f2
--- /dev/null
+++ b/data/type_effectiveness_generation-ii.json
@@ -0,0 +1,650 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ii"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-iii.json b/data/type_effectiveness_generation-iii.json
new file mode 100644
index 0000000..152686d
--- /dev/null
+++ b/data/type_effectiveness_generation-iii.json
@@ -0,0 +1,650 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iii"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-iv.json b/data/type_effectiveness_generation-iv.json
new file mode 100644
index 0000000..536ebe6
--- /dev/null
+++ b/data/type_effectiveness_generation-iv.json
@@ -0,0 +1,650 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-iv"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-ix.json b/data/type_effectiveness_generation-ix.json
new file mode 100644
index 0000000..bb7d691
--- /dev/null
+++ b/data/type_effectiveness_generation-ix.json
@@ -0,0 +1,722 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "fairy",
+    "damage_factor": 0.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-ix"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-v.json b/data/type_effectiveness_generation-v.json
new file mode 100644
index 0000000..3163ab8
--- /dev/null
+++ b/data/type_effectiveness_generation-v.json
@@ -0,0 +1,662 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-v"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-vi.json b/data/type_effectiveness_generation-vi.json
new file mode 100644
index 0000000..fa7b984
--- /dev/null
+++ b/data/type_effectiveness_generation-vi.json
@@ -0,0 +1,722 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fire",
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
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+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "dragon",
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "grass",
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "dragon",
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "water",
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "dragon",
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "rock",
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+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
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+    "defending_type": "flying",
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+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "fairy",
+    "damage_factor": 0.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vi"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-vii.json b/data/type_effectiveness_generation-vii.json
new file mode 100644
index 0000000..c5b354a
--- /dev/null
+++ b/data/type_effectiveness_generation-vii.json
@@ -0,0 +1,722 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
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+  },
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+  },
+  {
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+    "generation": "generation-vii"
+  },
+  {
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+    "generation": "generation-vii"
+  },
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+  },
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+  },
+  {
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+    "generation": "generation-vii"
+  },
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+    "generation": "generation-vii"
+  },
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+    "generation": "generation-vii"
+  },
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+    "generation": "generation-vii"
+  },
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "flying",
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+    "generation": "generation-vii"
+  },
+  {
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+    "generation": "generation-vii"
+  },
+  {
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "dragon",
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+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "fire",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "water",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "ice",
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+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "rock",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "steel",
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+    "generation": "generation-vii"
+  },
+  {
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "dark",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "flying",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "bug",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "steel",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "poison",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "rock",
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+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "grass",
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+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
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+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "fairy",
+    "damage_factor": 0.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-vii"
+  }
+]
\ No newline at end of file
diff --git a/data/type_effectiveness_generation-viii.json b/data/type_effectiveness_generation-viii.json
new file mode 100644
index 0000000..7acb3c2
--- /dev/null
+++ b/data/type_effectiveness_generation-viii.json
@@ -0,0 +1,722 @@
+[
+  {
+    "attacking_type": "normal",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "normal",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fire",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "water",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "electric",
+    "defending_type": "ground",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "water",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "grass",
+    "defending_type": "dragon",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ground",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ice",
+    "defending_type": "ice",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "normal",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fighting",
+    "defending_type": "ghost",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "poison",
+    "defending_type": "steel",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "steel",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "electric",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "bug",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "grass",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ground",
+    "defending_type": "flying",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "rock",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "flying",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "poison",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "psychic",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "psychic",
+    "defending_type": "dark",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "grass",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "flying",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "ghost",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "bug",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "flying",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "bug",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fire",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "ground",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "rock",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "ghost",
+    "defending_type": "normal",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dragon",
+    "defending_type": "fairy",
+    "damage_factor": 0.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "ghost",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "psychic",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fighting",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "dark",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "dark",
+    "defending_type": "fairy",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "rock",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "ice",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fairy",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "water",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "steel",
+    "defending_type": "electric",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fighting",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dragon",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "dark",
+    "damage_factor": 2.0,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "poison",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "steel",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  },
+  {
+    "attacking_type": "fairy",
+    "defending_type": "fire",
+    "damage_factor": 0.5,
+    "generation": "generation-viii"
+  }
+]
\ No newline at end of file
diff --git a/example_data/charizard.json b/example_data/charizard.json
deleted file mode 100644
index b085ffc..0000000
--- a/example_data/charizard.json
+++ /dev/null
@@ -1,158 +0,0 @@
-{
-  "6": {
-    "id": 6,
-    "name": "charizard",
-    "types": [
-      "fire",
-      "flying"
-    ],
-    "base_stats": {
-      "hp": 78,
-      "attack": 84,
-      "defense": 78,
-      "special_attack": 109,
-      "special_defense": 85,
-      "speed": 100
-    },
-    "abilities": [
-      "blaze",
-      "solar-power"
-    ],
-    "moves": [
-      5,
-      7,
-      9,
-      10,
-      14,
-      15,
-      17,
-      19,
-      25,
-      29,
-      34,
-      36,
-      38,
-      43,
-      44,
-      45,
-      46,
-      52,
-      53,
-      63,
-      66,
-      68,
-      69,
-      70,
-      76,
-      82,
-      83,
-      89,
-      90,
-      91,
-      92,
-      99,
-      102,
-      104,
-      108,
-      111,
-      115,
-      117,
-      126,
-      129,
-      130,
-      154,
-      156,
-      157,
-      163,
-      164,
-      173,
-      174,
-      182,
-      184,
-      187,
-      189,
-      200,
-      201,
-      203,
-      206,
-      207,
-      210,
-      211,
-      213,
-      214,
-      216,
-      218,
-      223,
-      225,
-      231,
-      232,
-      237,
-      239,
-      241,
-      242,
-      246,
-      249,
-      251,
-      257,
-      261,
-      263,
-      264,
-      270,
-      280,
-      290,
-      299,
-      307,
-      311,
-      314,
-      315,
-      317,
-      332,
-      337,
-      349,
-      355,
-      363,
-      366,
-      374,
-      394,
-      403,
-      406,
-      407,
-      411,
-      416,
-      421,
-      424,
-      432,
-      445,
-      466,
-      468,
-      481,
-      488,
-      496,
-      497,
-      507,
-      510,
-      512,
-      517,
-      519,
-      523,
-      525,
-      526,
-      535,
-      542,
-      590,
-      595,
-      612,
-      693,
-      784,
-      799,
-      814,
-      815,
-      851,
-      913,
-      915
-    ],
-    "weight": 905,
-    "height": 17,
-    "base_experience": 240
-  }
-}
\ No newline at end of file
diff --git a/example_data/charizard_moves.json b/example_data/charizard_moves.json
deleted file mode 100644
index 6a06c3d..0000000
--- a/example_data/charizard_moves.json
+++ /dev/null
@@ -1,212 +0,0 @@
-{
-  "5": {
-    "id": 5,
-    "name": "mega-punch",
-    "type": "normal",
-    "power": 80,
-    "accuracy": 85,
-    "pp": 20,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "7": {
-    "id": 7,
-    "name": "fire-punch",
-    "type": "fire",
-    "power": 75,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 10,
-    "target": "selected-pokemon",
-    "description": "Has a 10% chance to burn the target."
-  },
-  "9": {
-    "id": 9,
-    "name": "thunder-punch",
-    "type": "electric",
-    "power": 75,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 10,
-    "target": "selected-pokemon",
-    "description": "Has a 10% chance to paralyze the target."
-  },
-  "10": {
-    "id": 10,
-    "name": "scratch",
-    "type": "normal",
-    "power": 40,
-    "accuracy": 100,
-    "pp": 35,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "17": {
-    "id": 17,
-    "name": "wing-attack",
-    "type": "flying",
-    "power": 60,
-    "accuracy": 100,
-    "pp": 35,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "14": {
-    "id": 14,
-    "name": "swords-dance",
-    "type": "normal",
-    "power": null,
-    "accuracy": null,
-    "pp": 20,
-    "priority": 0,
-    "damage_class": "status",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "user",
-    "description": "Raises the user's Attack by two stages."
-  },
-  "15": {
-    "id": 15,
-    "name": "cut",
-    "type": "normal",
-    "power": 50,
-    "accuracy": 95,
-    "pp": 30,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "19": {
-    "id": 19,
-    "name": "fly",
-    "type": "flying",
-    "power": 90,
-    "accuracy": 95,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "User flies high into the air, dodging all attacks, and hits next turn."
-  },
-  "25": {
-    "id": 25,
-    "name": "mega-kick",
-    "type": "normal",
-    "power": 120,
-    "accuracy": 75,
-    "pp": 5,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "29": {
-    "id": 29,
-    "name": "headbutt",
-    "type": "normal",
-    "power": 70,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 30,
-    "target": "selected-pokemon",
-    "description": "Has a 30% chance to make the target flinch."
-  },
-  "34": {
-    "id": 34,
-    "name": "body-slam",
-    "type": "normal",
-    "power": 85,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 30,
-    "target": "selected-pokemon",
-    "description": "Has a 30% chance to paralyze the target."
-  },
-  "36": {
-    "id": 36,
-    "name": "take-down",
-    "type": "normal",
-    "power": 90,
-    "accuracy": 85,
-    "pp": 20,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "User receives 1/4 the damage it inflicts in recoil."
-  },
-  "43": {
-    "id": 43,
-    "name": "leer",
-    "type": "normal",
-    "power": null,
-    "accuracy": 100,
-    "pp": 30,
-    "priority": 0,
-    "damage_class": "status",
-    "effect_id": null,
-    "effect_chance": 100,
-    "target": "all-opponents",
-    "description": "Lowers the target's Defense by one stage."
-  },
-  "38": {
-    "id": 38,
-    "name": "double-edge",
-    "type": "normal",
-    "power": 120,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "User receives 1/3 the damage inflicted in recoil."
-  },
-  "44": {
-    "id": 44,
-    "name": "bite",
-    "type": "dark",
-    "power": 60,
-    "accuracy": 100,
-    "pp": 25,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 30,
-    "target": "selected-pokemon",
-    "description": "Has a 30% chance to make the target flinch."
-  }
-}
\ No newline at end of file
diff --git a/example_data/classic_moves.json b/example_data/classic_moves.json
deleted file mode 100644
index 04aa2be..0000000
--- a/example_data/classic_moves.json
+++ /dev/null
@@ -1,72 +0,0 @@
-{
-  "1": {
-    "id": 1,
-    "name": "pound",
-    "type": "normal",
-    "power": 40,
-    "accuracy": 100,
-    "pp": 35,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "2": {
-    "id": 2,
-    "name": "karate-chop",
-    "type": "fighting",
-    "power": 50,
-    "accuracy": 100,
-    "pp": 25,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Has an increased chance for a critical hit."
-  },
-  "33": {
-    "id": 33,
-    "name": "tackle",
-    "type": "normal",
-    "power": 40,
-    "accuracy": 100,
-    "pp": 35,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "Inflicts regular damage with no additional effect."
-  },
-  "34": {
-    "id": 34,
-    "name": "body-slam",
-    "type": "normal",
-    "power": 85,
-    "accuracy": 100,
-    "pp": 15,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": 30,
-    "target": "selected-pokemon",
-    "description": "Has a 30% chance to paralyze the target."
-  },
-  "36": {
-    "id": 36,
-    "name": "take-down",
-    "type": "normal",
-    "power": 90,
-    "accuracy": 85,
-    "pp": 20,
-    "priority": 0,
-    "damage_class": "physical",
-    "effect_id": null,
-    "effect_chance": null,
-    "target": "selected-pokemon",
-    "description": "User receives 1/4 the damage it inflicts in recoil."
-  }
-}
\ No newline at end of file
diff --git a/example_data/starter_pokemon.json b/example_data/starter_pokemon.json
deleted file mode 100644
index 789b600..0000000
--- a/example_data/starter_pokemon.json
+++ /dev/null
@@ -1,342 +0,0 @@
-{
-  "2": {
-    "id": 2,
-    "name": "ivysaur",
-    "types": [
-      "grass",
-      "poison"
-    ],
-    "base_stats": {
-      "hp": 60,
-      "attack": 62,
-      "defense": 63,
-      "special_attack": 80,
-      "special_defense": 80,
-      "speed": 60
-    },
-    "abilities": [
-      "overgrow",
-      "chlorophyll"
-    ],
-    "moves": [
-      14,
-      15,
-      20,
-      22,
-      29,
-      33,
-      34,
-      36,
-      38,
-      45,
-      46,
-      70,
-      72,
-      73,
-      74,
-      75,
-      76,
-      77,
-      79,
-      80,
-      81,
-      92,
-      99,
-      102,
-      104,
-      111,
-      113,
-      115,
-      117,
-      133,
-      148,
-      156,
-      164,
-      173,
-      174,
-      182,
-      188,
-      189,
-      200,
-      202,
-      203,
-      204,
-      206,
-      207,
-      210,
-      213,
-      214,
-      216,
-      218,
-      219,
-      230,
-      235,
-      237,
-      241,
-      249,
-      263,
-      267,
-      270,
-      275,
-      282,
-      290,
-      311,
-      331,
-      345,
-      363,
-      388,
-      402,
-      412,
-      437,
-      438,
-      445,
-      447,
-      474,
-      491,
-      496,
-      497,
-      520,
-      526,
-      580,
-      590,
-      803,
-      851,
-      885
-    ],
-    "weight": 130,
-    "height": 10,
-    "base_experience": 142
-  },
-  "1": {
-    "id": 1,
-    "name": "bulbasaur",
-    "types": [
-      "grass",
-      "poison"
-    ],
-    "base_stats": {
-      "hp": 45,
-      "attack": 49,
-      "defense": 49,
-      "special_attack": 65,
-      "special_defense": 65,
-      "speed": 45
-    },
-    "abilities": [
-      "overgrow",
-      "chlorophyll"
-    ],
-    "moves": [
-      13,
-      14,
-      15,
-      20,
-      22,
-      29,
-      33,
-      34,
-      36,
-      38,
-      45,
-      70,
-      72,
-      73,
-      74,
-      75,
-      76,
-      77,
-      79,
-      80,
-      81,
-      92,
-      99,
-      102,
-      104,
-      111,
-      113,
-      115,
-      117,
-      124,
-      130,
-      133,
-      148,
-      156,
-      164,
-      173,
-      174,
-      182,
-      188,
-      189,
-      200,
-      202,
-      203,
-      204,
-      206,
-      207,
-      210,
-      213,
-      214,
-      216,
-      218,
-      219,
-      230,
-      235,
-      237,
-      241,
-      249,
-      263,
-      267,
-      270,
-      275,
-      282,
-      290,
-      311,
-      320,
-      331,
-      345,
-      363,
-      388,
-      402,
-      412,
-      437,
-      438,
-      445,
-      447,
-      474,
-      491,
-      496,
-      497,
-      520,
-      526,
-      580,
-      590,
-      803,
-      851,
-      885
-    ],
-    "weight": 69,
-    "height": 7,
-    "base_experience": 64
-  },
-  "3": {
-    "id": 3,
-    "name": "venusaur",
-    "types": [
-      "grass",
-      "poison"
-    ],
-    "base_stats": {
-      "hp": 80,
-      "attack": 82,
-      "defense": 83,
-      "special_attack": 100,
-      "special_defense": 100,
-      "speed": 80
-    },
-    "abilities": [
-      "overgrow",
-      "chlorophyll"
-    ],
-    "moves": [
-      14,
-      15,
-      20,
-      22,
-      29,
-      33,
-      34,
-      36,
-      38,
-      45,
-      46,
-      63,
-      70,
-      72,
-      73,
-      74,
-      75,
-      76,
-      77,
-      79,
-      80,
-      81,
-      89,
-      92,
-      99,
-      102,
-      104,
-      111,
-      113,
-      115,
-      117,
-      133,
-      148,
-      156,
-      164,
-      173,
-      174,
-      182,
-      184,
-      188,
-      189,
-      200,
-      202,
-      203,
-      204,
-      206,
-      207,
-      210,
-      213,
-      214,
-      216,
-      218,
-      219,
-      230,
-      235,
-      237,
-      241,
-      249,
-      263,
-      267,
-      270,
-      275,
-      282,
-      290,
-      311,
-      331,
-      335,
-      338,
-      345,
-      363,
-      388,
-      398,
-      402,
-      412,
-      414,
-      416,
-      431,
-      437,
-      438,
-      445,
-      447,
-      474,
-      491,
-      496,
-      497,
-      520,
-      523,
-      526,
-      572,
-      580,
-      590,
-      707,
-      803,
-      805,
-      851,
-      885
-    ],
-    "weight": 1000,
-    "height": 20,
-    "base_experience": 236
-  }
-}
\ No newline at end of file
diff --git a/tools/data/pokemon_downloader.py b/tools/data/pokemon_downloader.py
index 29d6487..901544f 100644
--- a/tools/data/pokemon_downloader.py
+++ b/tools/data/pokemon_downloader.py
@@ -89,6 +89,7 @@ class TypeEffectiveness:
     attacking_type: str
     defending_type: str
     damage_factor: float  # 0.0, 0.5, 1.0, 2.0
+    generation: str  # generation name (e.g., "generation-i", "generation-ii")
 
 
 class PokemonDownloader:
@@ -235,59 +236,159 @@ class PokemonDownloader:
         except Exception as e:
             logger.error(f"Failed to download move {move_id}: {e}")
             return None
-    
-    def download_type_effectiveness(self) -> List[TypeEffectiveness]:
+
+    def download_type_effectiveness(self, target_generation: str = "generation-i") -> List[TypeEffectiveness]:
         """
-        Download type effectiveness data.
-        
+        Download type effectiveness data for a specific generation.
+
+        Args:
+            target_generation: Generation to get effectiveness for (default: "generation-i")
+
         Returns:
-            List of TypeEffectiveness objects
+            List of TypeEffectiveness objects for the specified generation
         """
         effectiveness_data = []
-        
+
         try:
-            # Get all types (Gen 1 has 15 types)
-            gen1_types = [
-                'normal', 'fire', 'water', 'electric', 'grass', 'ice',
-                'fighting', 'poison', 'ground', 'flying', 'psychic',
-                'bug', 'rock', 'ghost', 'dragon'
+            # First, build a cache of type generations to avoid repeated API calls
+            console.print("🔍 Building type generation cache...")
+            type_generations = self._build_type_generation_cache()
+
+            # Filter types that exist in the target generation
+            target_gen_index = self._generation_order.index(target_generation)
+            valid_types = [
+                type_name for type_name, gen_name in type_generations.items()
+                if self._generation_order.index(gen_name) <= target_gen_index
             ]
-            
-            for type_name in gen1_types:
-                type_data = self._safe_api_call(pb.type_, type_name)
-                
-                # Double damage to
-                for relation in type_data.damage_relations.double_damage_to:
-                    if relation.name in gen1_types:
+
+            console.print(f"📊 Processing {len(valid_types)} types for {target_generation}")
+
+            for type_name in valid_types:
+                try:
+                    type_data = self._safe_api_call(pb.type_, type_name)
+
+                    # Process current damage relations for the target generation
+                    current_relations = self._get_damage_relations_for_generation(
+                        type_data, target_generation, type_generations
+                    )
+
+                    # Add current generation effectiveness data
+                    for defending_type, damage_factor in current_relations.items():
                         effectiveness_data.append(TypeEffectiveness(
                             attacking_type=type_name,
-                            defending_type=relation.name,
-                            damage_factor=2.0
+                            defending_type=defending_type,
+                            damage_factor=damage_factor,
+                            generation=target_generation
                         ))
-                
-                # Half damage to
-                for relation in type_data.damage_relations.half_damage_to:
-                    if relation.name in gen1_types:
-                        effectiveness_data.append(TypeEffectiveness(
-                            attacking_type=type_name,
-                            defending_type=relation.name,
-                            damage_factor=0.5
-                        ))
-                
-                # No damage to
-                for relation in type_data.damage_relations.no_damage_to:
-                    if relation.name in gen1_types:
-                        effectiveness_data.append(TypeEffectiveness(
-                            attacking_type=type_name,
-                            defending_type=relation.name,
-                            damage_factor=0.0
-                        ))
-            
+
+                except Exception as e:
+                    logger.warning(f"Failed to process type {type_name}: {e}")
+                    continue
+
+            console.print(f"✅ Processed {len(effectiveness_data)} type effectiveness entries")
             return effectiveness_data
-            
+
         except Exception as e:
             logger.error(f"Failed to download type effectiveness: {e}")
             return []
+
+    def _build_type_generation_cache(self) -> Dict[str, str]:
+        """
+        Build a cache of type names to their generation.
+
+        Returns:
+            Dictionary mapping type name to generation name
+        """
+        type_generations = {}
+
+        # List of all known Pokemon types across all generations
+        all_types = [
+            'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+            'fighting', 'poison', 'ground', 'flying', 'psychic',
+            'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel',
+            'fairy'
+        ]
+
+        for type_name in all_types:
+            try:
+                type_data = self._safe_api_call(pb.type_, type_name)
+                type_generations[type_name] = type_data.generation.name
+            except Exception as e:
+                logger.warning(f"Failed to get generation for type {type_name}: {e}")
+                continue
+
+        return type_generations
+
+    @property
+    def _generation_order(self) -> List[str]:
+        """Get the order of generations for comparison."""
+        return [
+            'generation-i', 'generation-ii', 'generation-iii', 'generation-iv',
+            'generation-v', 'generation-vi', 'generation-vii', 'generation-viii',
+            'generation-ix'
+        ]
+
+    def _get_damage_relations_for_generation(self, type_data, target_generation: str, type_generations: Dict[str, str]) -> Dict[str, float]:
+        """
+        Extract damage relations for a specific generation from type data.
+
+        Args:
+            type_data: Type data from PokeAPI
+            target_generation: Target generation name
+            type_generations: Cache of type names to their generation
+
+        Returns:
+            Dictionary mapping defending type to damage factor
+        """
+        relations = {}
+
+        # Check if we need historical data
+        if type_data.generation.name == target_generation:
+            # Current generation - use current damage relations
+            damage_relations = type_data.damage_relations
+        else:
+            # Look for historical data
+            damage_relations = None
+            for past_relation in type_data.past_damage_relations:
+                if past_relation.generation.name == target_generation:
+                    damage_relations = past_relation.damage_relations
+                    break
+
+            # If no historical data found, use current relations
+            if damage_relations is None:
+                damage_relations = type_data.damage_relations
+
+        # Extract damage factors, filtering by generation
+        target_gen_index = self._generation_order.index(target_generation)
+
+        if hasattr(damage_relations, 'double_damage_to'):
+            for relation in damage_relations.double_damage_to:
+                # Only include types that exist in the target generation
+                defending_gen = type_generations.get(relation.name)
+                if defending_gen:
+                    defending_gen_index = self._generation_order.index(defending_gen)
+                    if defending_gen_index <= target_gen_index:
+                        relations[relation.name] = 2.0
+
+        if hasattr(damage_relations, 'half_damage_to'):
+            for relation in damage_relations.half_damage_to:
+                # Only include types that exist in the target generation
+                defending_gen = type_generations.get(relation.name)
+                if defending_gen:
+                    defending_gen_index = self._generation_order.index(defending_gen)
+                    if defending_gen_index <= target_gen_index:
+                        relations[relation.name] = 0.5
+
+        if hasattr(damage_relations, 'no_damage_to'):
+            for relation in damage_relations.no_damage_to:
+                # Only include types that exist in the target generation
+                defending_gen = type_generations.get(relation.name)
+                if defending_gen:
+                    defending_gen_index = self._generation_order.index(defending_gen)
+                    if defending_gen_index <= target_gen_index:
+                        relations[relation.name] = 0.0
+
+        return relations
     
     def download_pokemon_batch(self, start_id: int, end_id: int, max_workers: int = 5) -> Dict[int, PokemonData]:
         """
@@ -572,65 +673,101 @@ def download_moves(ctx, move_ids, workers):
 
 
 @cli.command()
+@click.option('--generation', default='generation-i', help='Target generation for type effectiveness')
 @click.pass_context
-def download_types(ctx):
+def download_types(ctx, generation):
     """Download type effectiveness data."""
     downloader = ctx.obj['downloader']
-    
+
     console.print(Panel.fit(
-        "🔽 Downloading type effectiveness data",
+        f"🔽 Downloading type effectiveness data for {generation}",
         style="bold blue"
     ))
-    
-    effectiveness_data = downloader.download_type_effectiveness()
-    
+
+    effectiveness_data = downloader.download_type_effectiveness(generation)
+
     if effectiveness_data:
-        downloader.save_type_effectiveness(effectiveness_data)
+        filename = f"type_effectiveness_{generation}.json"
+        downloader.save_type_effectiveness(effectiveness_data, filename)
         console.print(f"✅ Successfully downloaded {len(effectiveness_data)} type effectiveness entries")
     else:
         console.print("❌ Failed to download type effectiveness data")
 
 
+@cli.command()
+@click.option('--generations', default='generation-i,generation-ii,generation-iii,generation-iv,generation-v,generation-vi,generation-vii,generation-viii,generation-ix',
+              help='Comma-separated list of generations to download')
+@click.option('--workers', default=3, help='Number of concurrent workers')
+@click.pass_context
+def download_types_multi(ctx, generations, workers):
+    """Download type effectiveness data for multiple generations."""
+    downloader = ctx.obj['downloader']
+
+    generation_list = [gen.strip() for gen in generations.split(',')]
+    console.print(Panel.fit(
+        f"🔽 Downloading type effectiveness for {len(generation_list)} generations",
+        style="bold blue"
+    ))
+
+    total_entries = 0
+    for generation in generation_list:
+        console.print(f"\n📊 Processing {generation}...")
+
+        effectiveness_data = downloader.download_type_effectiveness(generation)
+
+        if effectiveness_data:
+            filename = f"type_effectiveness_{generation}.json"
+            downloader.save_type_effectiveness(effectiveness_data, filename)
+            total_entries += len(effectiveness_data)
+            console.print(f"✅ Saved {len(effectiveness_data)} entries for {generation}")
+        else:
+            console.print(f"❌ Failed to download data for {generation}")
+
+    console.print(f"\n🎉 Downloaded type effectiveness for {len(generation_list)} generations ({total_entries} total entries)")
+
+
 @cli.command()
 @click.option('--start', default=1, help='Starting Pokemon ID')
 @click.option('--end', default=151, help='Ending Pokemon ID (151 for Gen 1)')
 @click.option('--workers', default=5, help='Number of concurrent workers')
+@click.option('--generation', default='generation-i', help='Target generation for type effectiveness')
 @click.pass_context
-def download_complete(ctx, start, end, workers):
+def download_complete(ctx, start, end, workers, generation):
     """Download complete dataset (Pokemon, moves, and type effectiveness)."""
     downloader = ctx.obj['downloader']
-    
+
     console.print(Panel.fit(
-        f"🔽 Downloading complete Pokemon dataset ({start}-{end})",
+        f"🔽 Downloading complete Pokemon dataset ({start}-{end}) for {generation}",
         style="bold blue"
     ))
-    
+
     # Download Pokemon
     pokemon_data = downloader.download_pokemon_batch(start, end, workers)
-    
+
     if pokemon_data:
         downloader.save_pokemon_data(pokemon_data, f"pokemon_complete_{start}_{end}.json")
-        
+
         # Get all unique moves
         all_move_ids = set()
         for pokemon in pokemon_data.values():
             all_move_ids.update(pokemon.moves)
-        
+
         # Download moves
         if all_move_ids:
             moves_data = downloader.download_moves_batch(list(all_move_ids), workers)
             if moves_data:
                 downloader.save_moves_data(moves_data, f"moves_complete_{start}_{end}.json")
-        
-        # Download type effectiveness
-        effectiveness_data = downloader.download_type_effectiveness()
+
+        # Download type effectiveness for specified generation
+        effectiveness_data = downloader.download_type_effectiveness(generation)
         if effectiveness_data:
-            downloader.save_type_effectiveness(effectiveness_data, "type_effectiveness_complete.json")
-        
+            filename = f"type_effectiveness_complete_{generation}.json"
+            downloader.save_type_effectiveness(effectiveness_data, filename)
+
         # Show final summary
         summary_table = downloader.get_stats_summary(pokemon_data)
         console.print(summary_table)
-        
+
         console.print("🎉 Complete dataset download finished!")
     else:
         console.print("❌ Failed to download Pokemon data")
diff --git a/tools/data/schemas.py b/tools/data/schemas.py
index f7c63dc..6c657fe 100644
--- a/tools/data/schemas.py
+++ b/tools/data/schemas.py
@@ -111,9 +111,10 @@ TYPE_EFFECTIVENESS_ENTRY_SCHEMA = {
         "damage_factor": {
             "type": "number",
             "enum": [0.0, 0.5, 1.0, 2.0]  # Only valid damage multipliers
-        }
+        },
+        "generation": {"type": "string", "minLength": 1}  # Generation name (e.g., "generation-i")
     },
-    "required": ["attacking_type", "defending_type", "damage_factor"],
+    "required": ["attacking_type", "defending_type", "damage_factor", "generation"],
     "additionalProperties": False
 }
 
@@ -124,13 +125,58 @@ TYPE_EFFECTIVENESS_SCHEMA = {
     "uniqueItems": True
 }
 
-# Valid Generation 1 types for additional validation
-GEN1_TYPES = {
-    'normal', 'fire', 'water', 'electric', 'grass', 'ice',
-    'fighting', 'poison', 'ground', 'flying', 'psychic',
-    'bug', 'rock', 'ghost', 'dragon'
+# Valid types by generation for additional validation
+GENERATION_TYPES = {
+    'generation-i': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon'
+    },
+    'generation-ii': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel'
+    },
+    'generation-iii': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel'
+    },
+    'generation-iv': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel'
+    },
+    'generation-v': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel'
+    },
+    'generation-vi': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel', 'fairy'
+    },
+    'generation-vii': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel', 'fairy'
+    },
+    'generation-viii': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel', 'fairy'
+    },
+    'generation-ix': {
+        'normal', 'fire', 'water', 'electric', 'grass', 'ice',
+        'fighting', 'poison', 'ground', 'flying', 'psychic',
+        'bug', 'rock', 'ghost', 'dragon', 'dark', 'steel', 'fairy'
+    }
 }
 
+# Backward compatibility
+GEN1_TYPES = GENERATION_TYPES['generation-i']
+
 
 class DataValidator:
     """Validator class for Pokemon data using JSON schemas."""
@@ -260,27 +306,30 @@ class DataValidator:
     def validate_type_effectiveness(self, effectiveness_data: List[Dict[str, Any]]) -> List[str]:
         """
         Validate type effectiveness data.
-        
+
         Args:
             effectiveness_data: List of type effectiveness entries
-            
+
         Returns:
             List of validation error messages (empty if valid)
         """
         errors = []
-        
+
         # Schema validation
         for error in self.type_effectiveness_validator.iter_errors(effectiveness_data):
             errors.append(f"Schema error: {error.message}")
-        
-        # Additional validation
+
+        # Additional validation using generation-specific types
         for i, entry in enumerate(effectiveness_data):
-            if 'attacking_type' in entry and entry['attacking_type'] not in GEN1_TYPES:
-                errors.append(f"Entry {i}: Invalid attacking type '{entry['attacking_type']}'")
-            
-            if 'defending_type' in entry and entry['defending_type'] not in GEN1_TYPES:
-                errors.append(f"Entry {i}: Invalid defending type '{entry['defending_type']}'")
-        
+            generation = entry.get('generation', 'generation-i')
+            valid_types = GENERATION_TYPES.get(generation, GEN1_TYPES)
+
+            if 'attacking_type' in entry and entry['attacking_type'] not in valid_types:
+                errors.append(f"Entry {i}: Invalid attacking type '{entry['attacking_type']}' for {generation}")
+
+            if 'defending_type' in entry and entry['defending_type'] not in valid_types:
+                errors.append(f"Entry {i}: Invalid defending type '{entry['defending_type']}' for {generation}")
+
         return errors
     
     def validate_file(self, file_path: Path, data_type: str) -> List[str]: