Question

What Pokemon are good to use for the battle institute ?

Answer 1

I found that stall works really well in the Battle Institute so something like Mega Slowbro or Mega Sableye or Chansey will work great. I got five stars with nothing but stall.

Answer 2

#1 Truant Durant w/ Entrainment and sash.

It just needs to get Truant onto the enemy lead Pokemon.

#2 Setup sweeper w/ protect

Switch in on truant turns, protect on non-truant turns and setup till max on following truant turns. Proceed to sweep once sufficiently boosted.

This a just one idea and this really helped me.If you want to see more options, this might help you

Hope I helped!