Not a lot of guidebooks for anything outside their region. I guess that's not surprising, for people who think just one library for the entire region is perfectly fine.

[He's just never gonna be over Canalave being the only city with books in it]

But at least the majority who do evolve seem to just do it naturally as they grow. A few need ridiculously specific conditions, like being near that mountain range to the west. Something about magnetic fields.