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Pokémon Bank is out in the eShop.
Pokémon Bank is a piece of downloadable software that allows for you to store various Pokémon from your Pokémon X & Y games on the internet. It requires a yearly fee of 500¥ and has storage for up to 3,000 Pokémon. It also runs a trial for 30 days at any point until January 31st which is when it becomes a paid service.