"Dear Matt. Me and ToaCodyNuva (the co-author) now have large welts on our foreheads due to your review. First off, Regi does not mean region. It is a term for King. Second, there is no such thing as a Region Pokemon. Thirdly, DUH, the Regis are next!"
And I was thinking... instead of the Regis being life-size statues, they could be just statuettes that, when active, generate a cloak or something that looks like the Regi they are, and then go to the borders of the region, and proceed to generate a barrier similar to the one created in Atlantis: the Lost Empire.