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Understandably people feel a little bit shortchanged with only 70 new pokes. I mean I do too, but think about this.
A 3DS cartridge can store about 8GB of data. Pokemon X/Y takes up roughly 1.7GB (so ive heard). So the lack of pokemon was probably due to a shortage of time, not space.
But this is a next gen game. Don't you guys think its' pretty possible there'll be future expansions of more pokemon/post-game features, that you can download from the eshop??
Just food for thought