Following its reveal in the latest issue of CoroCoro magazine, Nintendo has officially announced one of the three previously rumored Pokémon hidden in Pokémon X and Y: #719 Diancie.
As reported, Diance is a Rock- and Fairy-type Pokémon with the Clear Body ability. According to CoroCoro, it will play a vital role in the upcoming Pokémon film, The Cocoon of Destruction and Diancie. Details on how to obtain Diancie in Pokémon X and Y will be announced in the near future, but until then, you can watch some brief footage of the mythical Pokémon in action below.
The Cocoon of Destruction and Diancie will premiere in Japan on July 19. A North American release has yet to be announced.
Source: Siliconera, Pokémon.com