Do you know the cuties in our fanart Cute cursor pack? Mew is a Psychic-type Mythical Pokémon introduced in Generation I that is not known to evolve into or from any other Pokémon. It is a member of the Mew duo along with Mewtwo. Mewtwo is a Psychic-type Legendary Pokémon introduced in Generation I who also is not known to evolve into or from any other Pokémon, but can Mega Evolve into two different forms: Mega Mewtwo X using Mewtwonite X and Mega Mewtwo Y using Mewtwonite Y.