Finnally, the e shop now has pokebank for sale! Balance of 0.00, though it's a monthly fee, depending if you have the month long free trial. It only lasts till' 3/31!
Ps. There's a free celebi as a gift for pokebank, and Battle ponits or pokebank.
Offical link: http://ign.com/articles/2013/12/18/a...or-free-celebi