>>38090904While there is no official map of the Pokémon world, I personally like to headcanon this image.
As far as regional development, I'd like to think that with Team Snagem and Cipher out of the way, for the most part, corruption is severely cut down and allows for some better organization of the region. Honestly, I find it baffling they don't import Pokémon with some terraforming abilities to come in and reshape small areas of the region over time. Like, who wouldn't benefit from this aside from the maybe 10 naturally occurring species of Pokémon?