In ASB, returning your Pokemon has always meant they're out of the battle forever, as if they've fainted (apart from some battles where the rules have allowed switching). Personally I think it's too much hassle to have an option to return a Pokemon mid-battle, and then send it out again at any point. I mean technically, you could just keep doing that and let the opponent loose through lack of energy
Although they do it in the anime, I don't really see it helping us here, and to be honest, after the inital thrill I don't even think it'd be used too often.
Oh and Raz, I was joking, hence the :p