It has too, I would think. The first four were all Japanese obviously in origin. Then, bang, Unova the America Region. That right there puts the western most and the eastern most locations reflected (in a manner, not the real furthest points in the real world, mind you) so with that there would have to be an infinite number of regions between the Pokemon Japan and Pokemon America.
I hope this game is only France, then we get Pokemon England or Pokemon Russia, or Pokemon Egypt, why not?