A couple of days ago this months edition of Japanese magazine CoroCoro leaked, bringing with it the reveal of a brand new Pokémon known as Diancie. Today the official website for Pokémon X and Pokémon Y has officially revealed the Pokémon outside of Japan and given us a very nice trailer showing the Pokémon off, which you can see below.
The Pokémon is still known as Diancie outside of Japan, and as previously reported is a Rock and Fairy Type. It's known as the Jewel Pokémon and the official site also mentions that Diancie is a rare Pokémon whom is loosely related to Carbink. The full write-up is as follows:
No details have been given on how to obtain Diancie currently. Diancie brings the current number of officially revealed Pokémon up to an impressive 719.