Well, try to put something that resembles a big building in Pallet Town, but call it Orudoran Castle. Then, for the rest of the towns just change them up a little. Use different tall grass for wild pokemon (you know the darker green) and just make it look kinda tropical haha. Like make Shino (Kanto) an island by itself and make Sacred Island island tropical looking. I hope it's not asking for too much. Kinda like Pokemon: Naranja.