Black Sludge is an item in Generation IV that restores a little bit of health for -type Pokémon each turn if the following Pokémon uses it as a held item. Other Pokémon that is not will lose damage each turn if held. It can be sold for 100 Pokédollars. Some trainers and leaders will have a pokemon holding Black Sludge which you can use the Thief to retrieve it.
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