Pokémon Bank

Pokémon Bank is essentially Pokémon Box for the new generation of Pokémon games, except using a special Internet cloud-based storage. When used in conjunction with the PokéTransporter, Pokémon from the Generation V games could be transferred into the Bank and then ported to Pokémon X and Y.

However, its long-anticipated (and perhaps quite poorly thought out) release date led to problems, as the Christmas season crippled Nintendo with a serious eShop server crash. Pokémon Bank was taken off the eShop in Japan mere hours after its release to avoid further problems. After being polished up in order to prevent another crisis, it returned to the Japanese eShop nearly a month later, followed by a European release three weeks later, and a North American release the day after.

Revisional Differences
The Japanese rerelease and the subsequent international releases were branded as "Ver. 1.1", as shown on the bottom-left of the top title screen in both applications.

Kalos Native Pokémon
Due to the nature of X and Y 's available Pokémon versus the various Pokémon unobtainable without Pokémon Bank (and perhaps to avoid complaints about hacked Pokémon), every Pokémon that is caught in X and Y is labelled with a small pentagon indicating that it is a native of the Kalos region. Additionally, a slightly-larger pentagon in the Pokédex indicates the Pokémon was caught in X and Y, while a Pokéball in the Pokédex indicates that the Pokémon was ported through Pokémon Bank and the PokéTransporter.

However, when Pokémon Bank was originally released in Japan (before it was taken down from the eShop temporarily), if a Pokémon in a Generation V game was tweaked slightly through hacking, when it was ported through the PokéTransporter it would be seen as a Kalos native.

This was fixed for the rerelease and international releases.