Well I looked at the battle tower pokemon by trainers list and saw:

PKMN Trainer Marley
PKMN Trainer Mira


I think you can team up with them in multi battles, but how?


Sorry if this is in the wrong forum =(

To fight alongside mira,marley and other people like riley and buck(or something) all you have to do is when the lady asks you if your you're gonna pair with a friend say no and she will take you to a room with only them in it.I'm doing this off of memory so I could be wrong.

In the Battle Tower go to the receptionist on the far left to get to the multi battle room. Then when she takes you to the room with the other trainers simply talk to one. They'll tell you what there pokemon are and one of there moves. You can then choose to join up with them or choose someone else.