I forgot the name of the trainers I fought, but after fighting trainers in The Under Subway, I failed to Snag Sneasel, Stantler and Gligar because I knocked them out accidentally. Then I just went back to the Subway after going a whole bunch of other places and all of the trainers were gone. o_O It says the only trainers you can only fight once are the trainers with Admin in their name. Does anybody know how to go back and get these Pokemon? It also happened with Aipom at the Shadow Pokemon Lab because I accidentally knocked it out but the trainer didn't reappear. Usually once I go somewhere else and go back to the area, the trainers want to battle again, but it didn't work this time.
I also had the same problem with Cipher Peon Reath, I failed to snag Remoraid but I'm to the point where Reath and the other one were arrested.