Frisk

Introduced in Generation IV

When this Pokémon enters battle, it reveals an opposing Pokémon's held item to all participating trainers. In a double battle, if one opponent has an item, this Pokémon will Frisk that Pokémon; if both have an item, it will Frisk one at random.

“When it enters a battle, the Pokémon can check an opposing Pokémon's held item.”