>>38292266Worldbuilding since Unova made it clear there are real world inspirations for ethnicities as far as the games are concerned.
Now, one can arguably say that while Kanto up to Sinnoh are based on Japan, there are still characters who are clearly not Japanese by name like Dahlia, Glacia (Prim) and Caitlin (Cattleya) and so forth and one could push the idea that there are little frontiers like language gaps and people can immigrate to anywhere in the world but the games keep dropping those cultural hints anyway.