Starphoenix
Member
He's arguably one of the most prime I think. I'm still pretty shocked he's not in the game.
Could have been a mixture of focusing on (and failing) to get Pokémon Trainer to work, pushing Greninja and Puff getting first dibs once again. I'm sure Sakurai knows how requested Mewtwo has been, considering how aware he's been of a lot of other things; and I doubt Game Freak will turn away any extra opportunity to have the Pokémon series featured prominently.