My question is what regions of Japan do you think they could use?
And just for fun, what geographical region on the planet Earth would you like to see in Pokemon?
Let's head down to Okinawa!! Swamps, beaches, and tropical forests filled with beasts, reptiles and amphibians-- sounds like a perfect spot. :D
Well Kanto/Johto cover the biggest centers of Honshu, Hoen did Kyushu and Sinnoh went up to Hokkaido. Let's head out farther out next!
Or maybe they could do the hiroshima/okayama area.