16. Pokemon X / Y
Pokemon isn't about catching 'em all. Yeah, that's in the song and everything and it's the slogan for the franchise, but no one in their right mind makes an attempt to catch every single Pokemon. There are, what, like, 700 now? That's insane. No, Pokemon is about the journey to catch 'em all. The trip through the world, through the gyms, through countless patches of high grass, through hundreds of Pokeballs as you attempt to conquer the region. And in that regard, Pokemon X and Y is utterly triumphant.
In many ways, X and Y's greatest success comes in unification (and 3D, of course). Every Pokemon game has added in new gimmicks, but never before has a game in the series done such a good job of making sure all of these different elements were tied together. This is fueled by the intuitive UI, which ditches many of the franchise's mainstays in favor of an overhaul that makes the new game feel like the most cohesive, socially-connected Pokemon adventure yet.