Black Sludge is an item in Generation IV. Before Generation VIII, it could be sold for 100.
When held by a Poison-type Pokémon, it restores 1/16 of its maximum HP at the end of each turn. If held by a Pokémon that is not Poison type, it loses 1/16 of its maximum HP each turn instead.
They can be found on wild Croagunks and Toxicroaks in the Sinnoh region games while in Pokémon HeartGold and SoulSilver, Black Sludge can also be found in Cerulean Cave.
In Pokémon Sun and Moon, and Ultra Sun and Moon, there is a 5% chance of wild Alolan Grimer holding them.
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