Almighty Zard
He has returned.
I'm going to assume you meant the one Ash fought in OS. If so, why would that be the one? We've see other Aerodactyl in the show.
still amuses me in general how Aerodactyl was at first a pokemon you'd want to avoid due to it's carnivore instincts, then by the time of Kalos we have one under the command of Trevor of all people.