If the free trial isn’t enough to convince you to download the Pokemon Bank App, perhaps this will: anyone who downloads the app prior to September 30, 2014 will be receiving a complimentary Celebi for use with a copy of Pokemon X or Y.
Celebi is a dual type Psychic/Grass legendary that was originally caught from the wild in Pokemon Crystal via an event activated by the GS Ball. In the story, Celebis are regarded as heralds of a prosperous and bright future in the Pokemon World. The free Celebi will come with the move Hold Back, which is a restraint attack that leaves the enemy with at least 1HP, making it the ideal move for capturing pokemon in the wild.
Pokémon Bank is set to arrive in the Nintendo 3DS eShop in North America on December 27. Download it before January 31 and you’ll get a month-long trial, after which it costs $4.99 per year.