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Someone should create a way to organize all of this into something that can be built on, it seems popular enough.
Instead of doing it the way the other group does though, let's limit it to a certain number of new Pokemon and allow previous Pokemon in the region in the form of new evolutions/preevolutions for relevant Pokemon.
In other news, I once designed and sprited a flying Eevee named Aereon/Aveon and a poison Eevee. Pic related.