Mewtwo will be able to evolve into Mega Mewtwo X or Mega Mewtwo Y depending on which Mega Stone it holds during battle - Mewtwonite X or Mewtwonite Y. Obviously, the "X" and "Y" denotes which version of the game is required to obtain the special Mega Stones.
Mega Mewtwo X gains the Fighting type to along with its Psychic type while Mega Mewtwo Y sees its Special Attack greatly boosted from its normal form.
You can check out both Mega Evolutions for Mewtwo with the just released screenshots and trailer.
Pokémon X and Y will be released on Oct. 12 for the Nintendo 3DS and the Nintendo 2DS which will release alongside the game. Limited Edition Pokémon X and Y Nintendo 3DS XL handhelds will also be available in stores on Sept. 27.
You can follow Scott via Facebook, Twitter, RSS feed or email alerts for all the latest game news and deals as well as the weekly Furious Fourcast podcast/videocast. All game news on Examiner can be followed at the Game On Facebook page and Twitter feed.