Pickpocket

Whenever a move makes contact with this Pokémon, if it does not have a held item, it steals the attacker's held item.

This Pokémon cannot steal upon being knocked out. It can steal if the attacker has a Substitute, but cannot steal when its own Substitute is hit. If a move hits multiple times, only the last hit triggers this ability. This ability cannot steal a Griseous Orb from Giratina, a Plate from a Pokémon with Multitype, a Drive from Genesect, or a Mega Stone from its corresponding Pokémon. If this Pokémon is wild, it cannot steal from a trained Pokémon.