i suggest putting dragon pulse on noivern for some dragon STAB
as for how to beat Radomus, your drapion can deal with gardevoir, just teach it cross poison from the move relearner, also a timis mismagius is a great asset, as it can eliminate his gallade and badly hurt his team, just use it carefully also you can catch a sewaddle in jaspe ward, leavanny has access to swords dance which can be helpful
OR use Perish song