I was just thinking that if Ash really does go against the entire E4 + Cynthia, what would make it really intriguing is if they had him use every Pokemon he's ever owned, as in he has to use a separate team for each match. If they were to keep the E4 to 5 Pokemon each and Cynthia with 6 like the games, Ash would need 26 different Pokemon, so he'd use all his Oak'd Pokemon, plus most or all the ones he's let go (Butterfree, Pidgeot, Primeape, etc.). It's a crazy idea, I know, but what do you think?