I've got an Aerodactyl, I just haven't trained him in a while. I feel kind of bad, but I've been trying to rotate through my roster in the order I got them. He's in the next set... I kind of got a ton of eggs and trades all at once a while back so I didn't get a chance to train them all properly. And I could probably handle more at once if I swapped out my main team, but I always keep Regal and Rachel on my team at least.