Mega Mewtwo Y Psychic Japanese Name: MegaMewtwo Y Height: 1.5m / 4' 11'' Weight: 33.0kg / 72.8 lbs. Classification: Genetic Pokémon Ability: Insomnia Revealed: This Pokémon was revealed on the 7th of April, 2013 during a Pokémon Smash show in Japan, and shortly after on the official Pokémon website. The April 2013 CoroCoro leaks confirmed the Pokémon to be a new form of Mewtwo as the original announcement didn't give anything away. Additional Info: Its streamlined body always appears to be floating in the air. Mewtwo's Mega Evolution is dependent on which version of the game you own: Mega Mewtwo X for Pokemon X and Mega Mewtwo Y for Pokemon Y. Mega Mewtwo Y's most notable stat boosts are to its Attack and Sp. Attack, but it also receives increases to its Sp. Defense and Speed stats. However, Mewtwo's Defense stat actually decreases slightly upon Mega evolving to its Y form. HP: 106 Attack: 150 Defense: 70 Sp. Attack: 194 Sp. Defense: 120 Speed: 140 Mega Stone: Mewtwonite Y X/Y: Pokémon Village's Unknown Dungeon. Mega Stone is exclusive to Pokémon Y. OR/AS: Pokémon League (Following Primal Kyogre/Groudon narrative). Mega-Evolves from Mewtwo.