oh wow! that is cool, first time i've seen this. EDIT: Confirmed that it works with GBC, and sort of with GBA. With the GBA mode, it just makes the screen smaller, but I tried on an ambassador game so maybe it works differently.
Black 2 FC: 3654 8353 8201 "Barkley: Shut up and jam! Gaiden" Is the best RPG of all time.