Note: You need the Nintendo Game Pokemon Pokemon X or Y and Internet conection in your 3DS / 3DS XXL
Add the grace and talents of the Mythical Pokémon Diancie to your game! Head to participating GameStop stores from October 27 to November 16, 2014, to pick up a special code card. When you enter the code into your Pokémon X or Pokémon Y game, you'll receive Diancie.
The story doesn't end there! When you transfer Diancie into your Pokémon Omega Ruby or Pokémon Alpha Sapphire game, you can get the Mega Stone that will allow Diancie to Mega Evolve during battle!