I thought I had an angle on it, but it wasn't entirely right. For some reason, I thought there was a big gathering of Ash's pokemon at the end of every region, but that is not so. The only big gathering I see was the one at the Battle Frontier's beginning. At the end of AG, they just showed Ash leaving off his Hoenn pokes, and that was it. It's still apparent that the Quilava ep was the only sight of Bayleef and Totodile we would get. I'm not angry, though.
Oh, and I just realized that this will be the only time in history that a full battle is happening in only one episode. I still wonder how in the world they are going to close the league in that short of time, but if they did it in Hoenn, they can do it here.