Thereallucario
Smash Journeyman
Hey I also just realized something. Back when they revealed Greninja, they mentioned something of a "placeholder spot" for a pokemon in sixth gen. If you follow the chain of thought that this is the only series we know that has done this, X and Y had the mega evos. and that Mewtwo is sakurai's most placed in character so far definitely backs up the six pokemmon theory. With extra space they could afford to have somewhat of a "we might need characters but this also doesn't need to be in the game" sort of situation. This seams WAY too good to be true though, so if something is fishy or flat out wrong with this please feel free to point it out.
Somone should really get that source permanently etched into this thread. its one of the most commonly used sources here."What is this new form of Mewtwo, and will it appear in Super Smash Bros?"
Something along those lines, I believe.