Pokémon Bank, Nintendo's subscription-based cloud storage app that allows users to deposit, store, and manage their Pokémon in private "boxes" on the internet, has been pulled from the Japanese eShop in an attempt to ease server strain.
Since the app's launch on Christmas (Dec. 25) in Japan, many of Nintendo's online services for Wii U and 3DS have been experiencing "technical difficulties." Problems are still occurring today across both platforms due to the recent linking of 3DS and Wii U online services through the Nintendo Network ID (NNID) system. Nintendo has provided a brief update, but no fix has been made as of this writing.
According to an official notice on Nintendo of Japan's website, Pokémon Bank was identified as the major cause of the server issues and, as a result, has been removed temporarily. Nintendo has no announced when the app will once again be available in Japan, but it's worth pointing out that the official Pokémon Bank page still lists it as releasing on December 27 in the United States and Europe. Of course, that could change should the server issues persist.
On a plus note, Nintendo assures that the free 30-day trial of the software will restart once the application does become available again.