Alolan Forms

In Pokémon Sun and Moon, if a Pokémon evolves from a species that does not have an Alolan Form to one that does, such as Cubone, it will always evolve into its Alolan Form and cannot evolve into its normal form. In Pokémon Ultra Sun and Ultra Moon, the Pokémon will evolve into its Alolan Form while in Alola itself, but can also evolve into its normal form while in Ultra Space.

There are 18 Alolan specific forms for existing Pokémon.