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This is the team I've been using since the third gym.
The top three I currently use in battle tower. They've gotten me to rank 7. I get unlucky sometimes and die after a couple fights now, but usually Ninjask can either sweep by himself or pass on +atk and +spd to Gyarados or Bewear. Only ever dynamax in emergencies or against Leon because he does it to his Zard.
For anyone curious Ninjask moves are: Protect, Baton Pass, Sword Dance and Leech Life.