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Deals damage and has a 10% chance to poison the target.
Despite being a Poison-type attack, Sludge Wave initially appears to be a good move with a high Base Power. However, when you look at the list of Pokemon who receive Sludge Wave, an overwhelming majority of them can not use Sludge Wave effectively. Nidoking and Nidoqueen are two exceptions. With STAB and Sheer Force, Sludge Wave reaches a massive Base Power of 185, enough to plow through any Pokemon that does not resist it. Sludge Wave is also useful in double and triple battles, as it can hit all enemy Pokemon with a slight damage reduction.
Sludge Bomb is a slightly weaker alternative with a higher chance to poison the target.