Mega Mewtwo X Psychic / Fighting Japanese Name: MegaMewtwo X Height: 2.3m Weight: 127.0kg Classification: Genetic Pokémon Ability: Steadfast Revealed: Mega Mewtwo X was first revealed within October CoroCoro leaks on September 11th, 2013 along with Mega Garchomp, Quilladin, Braixen, Frogadier, Meowstic, Furfrou , Amaura and Tyrunt . It was later revealed internationally on Sept. 13th. Additional Info: Mewtwo's Mega Form is dependent on which version of the game you have, Mega Mewtwo X for Pokemon X and Mega Mewtwo Y for Pokemon Y. Mega Mewtwo X's most notable stat boost is to its Attack but it also receives minor boosts in both Defense stats. HP: 106 Attack: 190 Defense: 100 Sp. Attack: 154 Sp. Defense: 100 Speed: 130 Mega Stone: Mewtwonite X X/Y: Pokémon Village's Unknown Dungeon. Mega Stone is exclusive to Pokémon X. OR/AS: Littleroot Town (Following Primal Kyogre/Groudon narrative). Mega-Evolves from Mewtwo.