I have a couple of problems with the seasonal idea as a whole.
Firstly, Pokemon games have never really had seasons involved in the game, very possibly because the work involved in making all areas not only change weather, but also seasons (which would require an entire re-colour and re-shade of all areas, as well as extra code) is rather high.
Secondly, Pokemon days are always in real time. I would think seasons would have to be as well. If I catch the seasonal pokemon for it's high speed, shall we say, I don't want to be stuck with a slow-as-hell pokemon for 6 months. Even more so because it usually takes less than that to complete the game. No-one would really notice the change.
Firstly, Pokemon games have never really had seasons involved in the game, very possibly because the work involved in making all areas not only change weather, but also seasons (which would require an entire re-colour and re-shade of all areas, as well as extra code) is rather high.
Secondly, Pokemon days are always in real time. I would think seasons would have to be as well. If I catch the seasonal pokemon for it's high speed, shall we say, I don't want to be stuck with a slow-as-hell pokemon for 6 months. Even more so because it usually takes less than that to complete the game. No-one would really notice the change.