You should level up your team and get some new team members. For example, you can get Scrafty at this point in the game. Use the Dull Key from the Railnet and unlock the door at the Slums. After you beat two Level 45 Pangoro and one at Level 50, you obtain Scraggy. Also, what gender is the Meowstic? If it's Meowstic M, then Prankster Dual Screens support is always helpful. F is also good, as Shadow Ball is boosted by the field.