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Muk did not originate from fanon, and more information can be found on their respective wiki(s). You may read more about it on the following wiki(s):

#089 Muk
Image from the Generation III games
Category Sludge Pokémon
Original Region Kanto
National Dex Nr. #089
Kanto Dex Nr. #089
Johto #118
Hoenn #112
Unova #065
Generation 1
Pokémon Color Purple
First Appearance Pokémon Red And Blue
Latest Appearance Pokémon Omega Ruby and Alpha Sapphire
Type(s) Poison
Ability/ies Stench/Sticky Hold
(Hidden: Poison Touch)
Average Height 3'11"
Average Weight 66.1 lbs.
Evolves From Grimer

#089 Muk
Alolan Muk's artwork for Pokémon Sun and Moon.
Category Sludge Pokémon
Original Region Kanto
National Dex Nr. #089
Kanto Dex Nr. #089
Alola #???
Generation 1
Pokémon Color Green
First Appearance Pokémon Sun and Moon
Type(s) Poison
Ability/ies Gluttony, Poison Touch
Average Height 3'03"
Average Weight 114.6 lbs.
Evolves From Grimer

Muk (Japanese: ベトベトン Betbeton) is a Poison-type Pokémon. It evolves from Grimer starting at level 38.

Muk has a rather colorful Alolan form, typed Poison/Dark.


Muk is a large, sticky, amorphous Pokémon, made of living purple sludge. It has two small eyes with beady black pupils. It also has an enormous mouth with a grey tongue and strands of ooze connecting its top and bottom jaws. While it has no visible legs, it does have two arms with three fingers on each hand. However, it typically keeps one hand tucked in while it extends the other hand.

It is a living biohazard, leaking toxins that instantly kill all plant life it touches. Even it being in close proximity to plants will cause them to wilt and die. Extreme caution is advised in avoiding any contact with this Pokémon, as an accidental brush up can lead to severe sickness. The effects of this Pokémon can leave the landscape barren for three years.

In dirty residential areas where people throw trash into the streets, it is almost certain to appear. It will readily consume nearly any waste or refuse generated by people and Pokémon alike. It can be found in heavily polluted bodies of water, cities and factories.



Base Stats
Sp. Attack
Sp. Defense


  • Although Muk's body is very poisonous, it doesn't seem to harm Ash and the others when Muk is 'hugging' them. This is probably because it is able to control whether it gives off poison or not, similar to how Ponyta can choose whether or not to burn the person that touches it. Croagunk is another Pokémon which is able to control the amount of poison it uses via its fingertips when using Poison Jab, or Sharpedo activating its Ability, Rough Skin.
  • Muk is tied with Mew for the shortest English name out of all Pokémon.
  • Muk shares similar traits to Weezing and Garbodor. All three Pokémon are pure Poison types with a single pre-evolution, roughly the same base stat totals and evolution levels, and appear to be based on a different kind of pollution; Muk being water pollution.




National Pokédex
← #088: Grimer
#089: Muk
#090: Shellder →

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