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Your team is good. But you need a Priority Special Sweeper like my Gengar. There are also too many physical sweepers on your team which were completely walled by my Hippowdon
I used legit pokemon. Hippowdon was using Leftovers. Dronzong had a macho brace(for gyro ball). Gengar had Black Sludge, and Snorlax Chesto Berry. Every item I used was legit