One of the two Pokémon Best Wishes movies that will premiere simultaneously on July 16th. The two titles are:

Pokémon Best Wishes! the Movie: Victini to Kuroki Eiyuu Zekrom
Pokémon Best Wishes! the Movie: Victini to Shiroki Eiyuu Reshiram

The stories of the two movies will be the same until Satoshi and Pikachu meet Victini but the legendary Pokémon will be either Zekrom or Reshiram.