FusionDex

Perhaps because of being overly-worshiped by ancient humans, Arcrua often hides itself by using illusions to mimic other Pokémon. It only shares its true form with those it comes to truly trust.

To protect themselves from danger, they hide their true identities by transforming into people and Pokémon. It is described in mythology as the Pokémon that shaped the universe with its 1,000 arms.