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When the wielder is struck by a contact move, it steals the opponent's held item. The effect of the attack resolves before the item is stolen, so if the wielder's item is removed as a result of the attack (via Pluck, Knock Off, Focus Sash's effect, or other similar effects) then Pickpocket will take effect. Pickpocket fails if this Pokemon already has an item, if it is behind a Substitute, or if the opponent has Sheer Force and attacks with a contact move that has an additional effect. Pickpocket will take effect even if the attacking Pokemon is behind a Substitute or has 0 HP remaining.
Pickpocket is basically the same as Thief, but without needing to use a moveslot, and can be effective in certain situations; Weavile can equip Focus Sash, take the hit, thus burning the Sash, and then trigger Pickpocket, robbing the foe of their item and then sneaking an Ice Shard in before they retreat.
Found in Dream World