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On November 19th, 2017, a new update for Pokémon Bank became available bring it to version 1.4 and it requires 516 blocks. The update now supports Pokémon Ultra Sun and Pokémon Ultra Moon.
Pokémon Bank Version 1.4 Notes:
This update must be applied in order to use the Internet features of Pokémon Bank.
Save data will still be available for use after downloading the update.
After downloading the update, please do not delete the update data. Update data can be viewed in the "Downloadable Content" area of the Data Management menu.
Pokémon Ultra Sun and Pokémon Ultra Moon are now supported.