A persistent hacker that goes by the name Smealum has been digging through the code of Pokémon X and Pokémon Y, and has uncovered three Pokémon that are not yet accessible, but whose assets and data are in the game. Take a look at them below.
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Diancie:
Hoopa:
Volcanion:
Just how these Pokémon will be accessible is not yet known. (Thanks, Serebii.net)