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>What if actually all the mons will be in the raids in game like events on specific day/month?
If that were the case, there would be no reason to bar people from trading their old Pokemon in the first place. Maybe it will happen a few months after launch but if it does it will be a gradually drip of ~5-10 Pokemon at a time, with an update for the game with each wave, and that's not going to make people very happy either and will take forever.