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there is a big difference: if you have metronome more than once in your moveslot it will literally do nothing after 16 turns, if you only have it once you will start to struggle
Edit: Small problem, but Wonder Guard (Shedinja), Pure/Huge Power (Diggersby, Azumarill, Medicham), and Arena Trap (Dugtrio) can't be used because of BH bans.