Mega Mewtwo Y

Mega Mewtwo Y is a Psychic-type Mega Evolved Pokémon from the Pokémon series that is one of two possible Mega Evolutions of Mewtwo, the other being Mega Mewtwo X. Like its base form, it appears at #150 in both the Kanto and National Pokédexes.

Like most Mega Evolved Pokémon, Mega Mewtwo Y requires a Mewtwo to have a close bond with its trainer and be holding its respective Mega Stone, which then reacts with its trainer's Key Stone in battle to trigger the Mega Evolution; because Mewtwo has two possible Mega Evolutions, Mewtwo will only become Mega Mewtwo Y if it is holding the Mewtwonite Y Mega Stone. Like all Mega Evolutions, Mega Mewtwo Y will revert back into Mewtwo once its power is exhausted or a battle ends. When Mewtwo Mega Evolves into Mega Mewtwo Y, it becomes smaller and more closely resembles Mew as its psychic powers are heightened even further. Mewtwo also gains a drastic boost in speed and mobility, becoming much more nimble due to its smaller size, but also makes Mewtwo more physically frail.

In M.U.G.E.N, Mewtwo has been made by various different creators, most of which are based on his normal form, while Mega Mewtwo Y has been made by Gladiacloud & Solarflared. A version of Mewtwo also appears as one of two final bosses of Project Catch 'Em All, along with Lugia.