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The wielder has a 10% chance of flinching the opponent whenever it attacks. This does not stack with King's Rock or Razor Fang. In-game, Stench decreases wild encounter rate.
Stench really isn't that viable, but can be good in a pinch if the luck is going for you. Garbodor, Skuntank, and Muk are three candidates for using Stench but the former two have a much better ability in Aftermath, and the latter is too slow to effectively make use of it.
Found in Dream World