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Prevents the opponent from consuming a held Berry while the wielder is on the field. Moves that involve such items (such as Bug Bite and Pluck) will work normally. An activation notification will be given when the wielder enters battle.
Every Pokemon that has access to this ability has a better option. Unnerve in itself is somewhat useless, as the only Berries that realistically see use are Lum, Chesto, and type-resist Berries, and Unnerve doesn't really do much to help win against Pokemon that would otherwise carry such Berries. It could be useful against stat-boosting Berries such as Petaya and Salac, but these are even more rare than the above. Even so, with powerful Berries such as Custap released, Unnerve can see some use—and indeed, Unnerve Mewtwo can actually turn out to be quite effective.
Found in Dream World