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Do you want them in X and Y? Personally I found season exclusive pokemon to be a bit of a pain when I wanted them, but it added a real sense of immersion to the games if only the trees lost their leaves in winter so I'd happily have them back. And nocturnal pokemon should return too IMO. I also want variable weather based on seasons, random rain in autumn, sun in summer etc and pokemon which only come out in those weathers. For example an earthworm pokemon which only surfaces in the rain.