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I read a fanfic with an oc trainer once that was surprisingly well written, and they actually touched on this. It was never brought up directly, but there were a few passing references to "psychic type supremacy" and the main character mentioned the phrase "go Team Payapa" a few times with a sort of fond remembrance. Payapa berries, if you don't remember offhand, weaken psychic attacks when held. It's implied something happened a few years ago; nothing as dramatic as a violent uprising, but more of like some long held tensions coming to a brief but probably violent head. None of this was shown firsthand, and most of the fic was actually pretty mellow, so it thankfully steered well clear of the grimderp that infests most pokemon fanfiction.