But by how much is what I'm wondering. Will it change drastically like some Pokemon just wont ever appear in winter, or will the rarity change by about 50%?
I'd bet that there's at least one pokemon that will only be available in a certain season. Otherwise it would be a lame gimmick. Having a polar bear that's only around in the winter would be a "neat" gimmick. I would guess that the way the seasons effect availble pokemon would be an extension of the way the day/night cycle does.
