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There is evidence that the dex is a load of hooey, even in the games. I think that the size variance by those "catch me x" games is a lot larger than what would be suggested if the dex is some kind of average. People have a lot of ideas about what is supposed to be bigger/smaller, and I've seen few places where pretty much everyone agrees with it. Some have no problem with the size given. It's all a mixed up mess, and you might as well ask how big do people expect their pokemon to be? There is some amount of the matter that this game is supposed to be seen through the eyes of a child, so of course they would be smaller, and thus a lot more of them would be bigger. Do they have to be bigger than you? I would think there are plenty where the intent is they're not supposed to be big.