According to Nikkan Sports, two Pokemon Best Wishes movies! will be premiered simultaneously on July 16th. The titles are :
Pokemon Best Wishes! the Movie : Victini and The White Hero – Reshiram
Pokemon Best Wishes! the Movie : Victini and The Dark Hero – Zekrom
The stories of the two movies will be the same until Satoshi and Pikachu meet Victini but the legendary Pokemon will be either Zekrom or Reshiram.