Sludge does damage and has a 30% chance of poisoning the target. Sludge cannot poison a target that has a Substitute, already has a major status ailment, or is a Template:Type2 or Template:Type2.
Template:Breedlist
|-
| style="background: #FFF; font-family:monospace,monospace" | 0001
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Bulbasaur
| colspan="1" style="background:#3FA129; text-align: center;" | Grass || style="background:#9141CB" align="center" colspan="1" rowspan="1" | Poison
| style="background: #FFF" | Mudkip, Marshtomp, Swampert
|-
| style="background: #FFF; font-family:monospace,monospace" | 0258
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Mudkip
| colspan="2" style="background:#2980EF; text-align: center;" | Water
| style="background: #FFF" | Shellos, Gastrodon
|-
| style="background: #FFF; font-family:monospace,monospace" | 0422
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Shellos
| colspan="2" style="background:#2980EF; text-align: center;" | Water
| style="background: #FFF" | Grimer, Muk Koffing, Weezing Gulpin, Swalot
|-
| style="background: #FFF; font-family:monospace,monospace" | 0422
| style="background: #FFF; text-align: center;" |
| style="background: #FFF" | Shellos
| colspan="2" style="background:#2980EF; text-align: center;" | Water
| style="background: #FFF" | Grimer, Muk Koffing, Weezing Gulpin, Swalot
|-
| colspan="6" | Bold indicates a Pokémon which gets STAB from this move. Italic indicates a Pokémon whose evolution gets STAB from this move. *Indicates Pokémon that can only learn the move through chain breeding.
|}
|}
Misty's Horsea can use Sludge, although it cannot legally learn this move in any game. This is an example of anime move errors.
Coincidentally, all of the Pokémon to learn this move by leveling up are a part of a two-stage evolutionary line. Also, with the exception of Gulpin, they are all purple.