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I got Master Rank today using Dracozolt/Corviknight/Tyranitar/Grimmsnarl/Seismitoad/Ditto. It was pretty easy, I get the feeling you can reach Master Rank using any half-competently made team as long as you're decent at the game. In Master Rank there are somehow still people who Fishious Rend into Seismitoad not knowing it has Water Absorb.
Most of the time I just used Grimmsnarl/Corviknight/Tyranitar and then occasionally brought Dracozolt if they were running Rotom/Corv/Togekiss, or Seismitoad if they were running Dracovish. I never used Ditto, it's mostly just there as deterrent in Team Preview to stop people from getting cocky about setting up. I used Grimmsnarl to set up screens and to paralyze sweepers, Corviknight to hard counter pretty much every physical attacker in the game, and Weakness Policy Tyranitar using the special variant with Dark Pulse/Fire Blast/Thunderbolt/Ice Beam because it works well with Max Darkness lowering Sp. Def and it fucks over people who waste time trying to burn it or keeping their physical walls in because they assume it's a physical attacker. I had the most trouble with any team that uses sleep, namely Yawn Hippowdon/Sylveon and Sleep Powder Butterfree.