Could you train me in the ways of the cool kids?
0^0
Probably talking about doing live battles against high ranked players who put a trainer as their leader. Can repeat these battles quickly as long as your stam is equal or greater than your leader's cost; some people put a 2 cost idol as lead to spam like crazy. Also, afaik, the idol you want to raise affection on needs to be in the battle, so plan accordingly.
Edit: Able to do battle at 9 stam with a 10 cost leader, so it doesn't have to be equal all the time.