Sludge(ヘドロこうげき Sludge Stream) is a Poison-type move introduced in Generation I. The Pokémon who uses this move tosses toxic waste at the foe to inflict damage. This move has a 30% chance[1] of poisoning the opponent. This move cannot poison a target that has a Substitute, is a Poison or Steel-type Pokémon, or already has a major status affliction.