I don't like this idea, it's pointless in my opinion. And if you meant like trainer exp then SurpasserS and Uberdua would always win and that's not fair to others, if t were amount of battles then this would be a good idea. I would rate this idea 2/10.

what if there's also a cap for the level of pokemon that are needed to enter so that Uberdua and SurpasserS won't be so OP? that could level the playing field...