I just noticed something after battling in the Battle Frontier for so long: the rental Pokémon you get from the Battle Factory are practically the same Pokémon the opponents use in all the other Battle areas. It's true. I can almost swear, I fought an Aipom with the moves Thunder Wave, Double Hit, U-Turn, and Fake Out in one of the others areas and that same Aipom was up for rental in the Battle Factory. It's bizarre... O_O