>>30735327If by regional Pokémon you mean something similar to Alolan forms, taking previous generations Pokémon and giving them new Sinnoh forms, not quite, but something similar.
What I think they should've done is expand on Gastrodon's gimmick and give it to other Pokémon introduced in that generation, giving them Western and Eastern forms depending on which side of Mt. Coronet you encounter them. Preferably with different typings. Think things like Poison/Fighting Western Croagunk and Poison/Fire Eastern Croagunk, that kind of thing. So in a way, similar to Alolan forms, but within the same region. Would've been a good way to pad out the dex without actually adding more new Pokémon, but also without falling back too much on old ones.