Image:Pokéball Sprite.png This Pokémon related article is a stub. Please help by expanding it. Image:Pokéball Sprite.png Black Sludge is an item in various Pokémon games. It restores a Poison type Pokémon's HP when held, but will lower any other type of Pokémon's health. It is sometimes found being held by wild Croagunks and Toxicroaks.