>>21078013Assurance > Night Slash on Bisharm most of the times if you use it correctly.
Both Thunderbolt and Volt Switch are kinda of a waste on Rotom-H, consider Protect or even HP-Ice or Twave
Leftovers is kinda meh on Gyarados, consider Lum or Wacan Berry
Drop one attacking move on Amoongus for Protect, which is very useful since Amoongus is often double-targetted
I'd use Protect over Sub on MMedicham, but that's could work too.
Swagger is a good move on Meowstick, it punish your opponent far more than the little damage you'd deal with Psychic.
Taunt is pretty uncommon, so don't worry about not having attacking moves.