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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 or Pluck) will work normally. An activation notification will be given when the wielder enters battle.
Every Pokemon that obtains 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, if powerful Berries such as Custap are ever released, Unnerve may see some use—and indeed, such a fear means that Unnerve Mewtwo may actually turn out to be quite effective, whenever Mewtwo gets its Dream World ability.
Found in Dream World