>>19177254That's because of the places they were based on. Central Japan is just temperate, so obviously it's going to just have regular old cities and an unremarkable landscape. Same with Unova, which is based on NY/NJ, a generally urban and temperate area. And Kalos is based on France, another temperate area.
Whereas Hoenn's based on Kyushu and various pacific islands, which gives it a more tropical theme. And Sinnoh is based on Hokkaido, known for its rugged terrain and snowy, barren north.
Owing to their inspirations, Sinnoh and Kanto are the most boring regions with Johto and Hoenn following after. The only things that save Johto are its old japanese-type aesthetics in Ecruteak etc.
