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I have no idea why I've never seen another Muk in online. This guys saves me so well as he's a perfect tank with a super potent attack.
Usually I'd start with infestation to sap HP over time, then use acid armor on him for a few turns, black sludge replacing some health, soon becomes a tank for what might come, and then use a Gunk Shot and it almost always gets a OHKO. If not, it often poisons them so infestation + poison can do their thing.