From Bulbanews, your community Pokémon newspaper.
First 3 million viewers of The Cocoon of Destruction and Diancie will be given it
The Diancie Pokémon Tretta
The first 3 million viewers of this year's Pokémon movie The Cocoon of Destruction and Diancie and the Pikachu short Pikachu, What Are These Keys For? in Japanese cinemas will receive a special Pokemon Tretta featuring Diancie. The Diancie Tretta being given away will be usable from The Pokemon Tretta Set 02 which starts to be distributed on the 10th July. This special Pokemon Tretta is a Tretta that won't be distributed at normal Tretta machines. The Diancie from Diancie Tretta being given away knows Moonblast and comes in a Cherish Ball like the event Diancie for Pokémon X and Y versions that viewers will also be able receive in cinemas.
Thanks to Bluesun for the translation.