From Bulbapedia, the community-driven Pokémon encyclopedia.
List of moves
Shadow moves are moves exclusive to Shadow Pokémon in the Generation III games Pokémon Colosseum and Pokémon XD: Gale of Darkness. There are no contests in these games, and Shadow Pokémon can not be traded, thus they have no Contest statistics.
Other ??? moves
These moves are exclusive to Pokémon Mystery Dungeon and Pokémon Mystery Dungeon 2.