The mythical Pokémon, Volcanion, is currently being distributed via GameStop. Participating stores will be giving out codes that can be used to download Volcanion to your game.
Volcanion is LV. 70 with the ability Water Absorb and the moves Steam Eruption, Flamethrower, Water Pump, and Explosion. By inputting the download code in the Mystery Gift option, Volcanion can be added to either Pokémon X, Pokémon Y, Pokémon Omega Ruby, or Pokémon Alpha Sapphire. This promotion will last until October 31st, 2016.