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??? was the type of the move "Curse" which affects non-Ghost type Pokémon differently from Ghost types, and an unused sprite of Arceus. It started in Generation II but as of Generation V, Curse has been reclassed to a Ghost-type move and the type has been retired.
Other instances[]
In Pokémon XD: Gale of Darkness, if a Pokémon uses the move Shadow Sky and another use Weather Ball, Weather Ball will be a ??? type attack.
In Generation IV, if a pure Flying type uses the move Roost, it will be turned into ??? type for the rest of the turn. However, since there were none until Generation V, the Pokémon must have the ability Color Change or use Conversion to change into a Flying type.
On official material, the ??? type can be used to denote a type that has not yet been revealed.