PlayerPokemon that should be fused
PlayerPokemon that should be fused with playerPokemon
always Promise
Checks if FusePokemonModifier should be applied
OptionalplayerPokemon: PlayerPokemonPlayerPokemon that should be fused
OptionalplayerPokemon2: PlayerPokemonPlayerPokemon that should be fused with playerPokemon
true if FusePokemonModifier should be applied
Applies FusePokemonModifier