Pokémon Bank is an application and service for Pokémon X and Pokémon Y that will allow you to deposit, store, and manage your Pokémon in private Boxes on the Internet! Pokémon Bank is a paid service, with an annual charge for usage.
Pokémon Bank will be a powerful resource for players who like to obtain many different kinds of Pokémon, or for those who like to raise many Pokémon in preparation for battles and competitions! The application has a variety of search functions, so you can find the Pokémon you're after among all of the Pokémon you've deposited. Even if you deposit a lot of Pokémon, you won't have to worry about being unable to find the Pokémon you need! Pokémon Bank also makes it easy to transfer Pokémon from multiple copies of Pokémon X and Pokémon Y—including the downloadable versions—to a single game!
When you download Pokémon Bank, you can also download the free linked application Poké Transporter! When you insert a Pokémon Black Version, Pokémon White Version, Pokémon Black Version 2, or Pokémon White Version 2 Game Card into a Nintendo 3DS system, you'll be able to use Poké Transporter to transfer Pokémon from these games into their own online Boxes. Then, you can easily transfer those Pokémon into Pokémon X and Pokémon Y using Pokémon Bank!