We’ve known for a long time now that the National Pokédex in Generation Six has room for 721 Pokémon, but only 720 have been officially announced to the world. The final mystery Pokémon was discovered to be a Water/Fire type Mythical Pokémon named Volcanion a long time ago (there is data for Volcanion inside the games), and now The Pokémon Company will finally be revealing it to the world.
The cover for the latest issue of Japanese publication CoroCoro has leaked early, and Volcanion is pictured. According to reliable
Pokémon site Serebii, it has been confirmed that Volcanion will star in the upcoming nineteenth Pokémon movie. Hopefully this means that Volcanion will be coming to the games soon as well.