Frisk

The Pokémon can check a foe's held item.

Game descriptions

Diamond, Pearl, Platinum, HeartGold, SoulSilver:The Pokémon can check the foe’s held item.
Black, White, Black 2, White 2:The Pokémon can check a foe’s held item.
X, Y, O.Ruby, A.Sapphire:The Pokémon can check an opposing Pokémon’s held item.
Sun, Moon, Ultra Sun, Ultra Moon:When it enters a battle, the Pokémon can check an opposing Pokémon’s held item.
Sword, Shield, B.Diamond, S.Pearl:When it enters a battle, the Pokémon can check an opposing Pokémon’s held item.
Scarlet, Violet:When it enters a battle, the Pokémon can check an opposing Pokémon’s held item.