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I'm at 1272 with pic related
Nihilego is only there to be a suicide lead, put up toxic spikes and let porygon have a very good time recovering off all the damage, while muk exists to take toxics meant for P2, and also destroy tapus (Gunk shot has a good chance to OHKO fini, and if it doesn't she's then in range for a shadow sneak, all the others obviously get OHKOed)
Gyarados is there to remove landorus, garchomp, metagross, and basically any earthquake user that threatens the team since both muk and nihilego get destroyed, and the others are too frail
Pheromosa and Lele simply exist to clean up and revenge kill after most of the enemy team is worn down by porygon and all the poison