The official Japanese Pokémon website has revealed that Pocket Monsters X and Y will both be available to purchase via download cards that are sold at participating retail stores across Japan. The download cards are separate to the physical cart versions as players can use the purchased download card to directly download the games from the Nintendo 3DS eShop to their Nintendo 3DS. Players will need to have at least 1.7GB or approximately 14,000 blocks of free space on their SD card to download each game. Players that download both Pocket Monsters X and Y will be unable to have the two games communicate on the same system should they both be downloaded.
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The full box art for the
Pocket Monsters X and Y Pack - Xerneas and Yveltal - Blue (ポケットモンスター X・Y パック ゼルネアス・イベルタル ブルー) has been revealed.
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Source:
http://www.pokemon.co.jp/info/2013/08/130802_g01.html