...a Pokémon as nickname which is to be the Head Part of the fusioned Pokémon
Fusioned Pokémon's base stats of H P, SpA, SpD = That base stats of Head * 2 / 3 + That base stats of Body * 1 / 3
Fusioned Pokémon's base stats of Atk, Def, Spe = That base stats of Head * 1 / 3 + That base stats of...