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PULSE Swalot, presumably Water/Poison, Poison heal ability. Kylie quickly got KO'd, so Magnezone comes in.
We're fighting on Murkwater, so Muddy Water's power is boosted and this Swalot lives to spam it. Poison Heal is also activated by the field, so this swalot regens a fuckton of HP.
Fortunately, the water also boosts the power of Magnezone's Discharge.