Meanwhile on serebii
"Today in Japan, the latest Pokémon movie, Hoopa & The Clash of Ages, opened and within it, according to our envoy and close friend to the site, Gin who saw the movie, there was a new Pokémon appearing in it. She describes the Pokémon as being bright green with one eye larger than the other. During the trailer for next years movie, its eye looked through the O of the word movie and then it blobbed about. This was then followed by the large new Pokémon silhouette revealed on July 12th. Gin has kindly provided a sketch of this Pokémon, but it is likely to differ greatly. We'll bring full details of this as and when it comes so keep checking."