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Muk (Alola Form) is a Poison & Dark Pokémon which evolves from Grimer. It is vulnerable to Ground moves. Muk's strongest moveset is Snarl & Gunk Shot and it has a Max CP of 2,757.
"From Muk's body seeps a foul fluid that gives off a nose-bendingly horrible stench. Just one drop of this Pokémon's body fluid can turn a pool stagnant and rancid."
This set offers greater consistent damage than the Snarl set thanks to Poison Jab's fairly high DPT. Dark Pulse is necessary coverage, hitting most Poison-resistant Pokemon for neutral damage. Acid Spray is Alolan Muk's cheapest attack and helps amplify its consistent damage to oppressive levels, especially in more lengthy matchups. It is chosen over Gunk Shot and Sludge Wave as Alolan Muk already deals good enough Poison-type damage, and its ability to debuff through shields is more valuable.
Snarl's great energy generation allows it to leverage a fairly expensive set of charged moves with very solid coverage. Dark Pulse is mandatory as A-Muk's Dark-type move. Sludge Wave and Gunk Shot are both totally viable options for your secondary. Sludge Wave's lower energy cost can make it a little less punishing if it gets shielded and is generally the preferred choice, though Gunk Shot's stronger if it lands (and also has a funny trash can animation).
Passable bulk, a single weakness to Ground, and great neutral coverage make Alolan Muk a totally solid choice in the Great League format. Not much actually walls it out, and it has pretty good matchups against many of the top Pokémon in the format! It's not, and likely never will be, top tier, but that doesn't stop it from being perfectly usable a lot of the time.
Note that Drapion, Skuntank, and XL Alolan Grimer compete for similar roles as Alolan Muk. Their access to cheaper moves and/or wider coverage can make it harder to justify picking Alolan Muk over them.
Alolan Muk is a force to be reckoned with, being a good generalist thanks to its typing and sporting key wins against Cresselia and Trevenant. The increased bulk in the Ultra League allows Alolan Muk to make greater use of Acid Spray's debuff and dominate lengthy matchups. It still faces competition from Drapion and Skuntank, however. Note that Alolan Muk is the only one of the three Poison/Darks to not require XLs to hit 2500 CP, making it viable for formats that ban Pokemon powered up by Candy XL.
Alolan Muk just doesn't cut it in Master League, as its max CP is too low.
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