Encounter locations
| Region | Location | Method | Level |
|---|---|---|---|
| Kanto | Celadon City | Surf | 20–40 |
| Kanto | Pokémon Mansion 1F | Walking | 32 |
| Kanto | Pokémon Mansion 2F | Walking | 32 |
| Kanto | Pokémon Mansion 3F | Walking | 32 |
| Kanto | Pokémon Mansion B1F | Walking | 34 |
| Kanto | Route 16 | Walking | 23–25 |
| Kanto | Route 17 | WalkingDay | 25–27 |
| Kanto | Route 17 | WalkingNight | 25–29 |
| Kanto | Route 18 | Walking | 27–29 |
| Unova | Route 9 | Overworld swarmOnly while this swarm is active | — |
| Johto | Celadon | Surf | 15 |
| Johto | Route 16 East | WalkingDay | 30 |
| Johto | Route 16 East | WalkingNight | 30 |
| Johto | Route 17 | WalkingDay | 32 |
| Johto | Route 17 | WalkingNight | 30–32 |
| Johto | Route 18 | WalkingDay | 30 |
| Johto | Route 18 | WalkingNight | 29–30 |
Check the Town Map to see which swarms are active.
This guide covers documented encounter tables and selected story events. Other scripted gifts or events may also award this Pokémon.
Natures
Randomly generated Pokémon can have any of the 25 natures. Twenty raise one stat by 10% and lower another by 10%. Five are neutral. HP stays the same.
View all 25 natures and stat effects
| Nature | Raises (+10%) | Lowers (−10%) |
|---|---|---|
| Hardy | — | — |
| Lonely | Attack | Defense |
| Brave | Attack | Speed |
| Adamant | Attack | Special Attack |
| Naughty | Attack | Special Defense |
| Bold | Defense | Attack |
| Docile | — | — |
| Relaxed | Defense | Speed |
| Impish | Defense | Special Attack |
| Lax | Defense | Special Defense |
| Timid | Speed | Attack |
| Hasty | Speed | Defense |
| Serious | — | — |
| Jolly | Speed | Special Attack |
| Naive | Speed | Special Defense |
| Modest | Special Attack | Attack |
| Mild | Special Attack | Defense |
| Quiet | Special Attack | Speed |
| Bashful | — | — |
| Rash | Special Attack | Special Defense |
| Calm | Special Defense | Attack |
| Gentle | Special Defense | Defense |
| Sassy | Special Defense | Speed |
| Careful | Special Defense | Special Attack |
| Quirky | — | — |
Stats and abilities
- HP
- 105
- Attack
- 105
- Defense
- 75
- Sp. Attack
- 65
- Sp. Defense
- 100
- Speed
- 50
Abilities · Stench / Sticky Hold
Hidden ability · Poison Touch
Size · 1.2 m · 30 kg
Evolution and forms
- From Grimer · Level 38
Other forms · Alolan Muk
Level-up moves
View level-up moves for Muk
| Level | Move |
|---|---|
| 1 | Pound |
| 1 | Harden |
| 1 | Poison Gas |
| 1 | Mud Slap |
| 12 | Disable |
| 15 | Sludge |
| 18 | Mud Shot |
| 21 | Minimize |
| 26 | Toxic |
| 29 | Sludge Bomb |
| 32 | Sludge Wave |
| 37 | Screech |
| 40 | Gunk Shot |
| 46 | Acid Armor |
| 52 | Belch |
| 57 | Memento |