The official Pokémon movie website has updated. Translations follow:

Thursday July 16th, "The Cocoon of Destruction and Diancie" and "Pikachu, What Kind of Keys Are These?" will be broadcast for the first time ever on a 2 hour special you just can't miss!

Summer means Pokemon! The double feature "Pokémon the movie XY: The Archdjinni of Rings - Hoopa/Pikachu and the Pokémon Musicians" finally premieres next month, and to celebrate, we will broadcast last year's blockbuster movie "The Cocoon of Destruction and Diancie" and the short "Pikachu, What Kind of Keys Are These?" for the first time ever!!



And not only that! We will also show world exclusive footage from the feature film premiering this summer!
Lots of legendary Pokémon from earlier movies and episodes are going to appear.
A grand battle will take place on the big screen! And in this 2 hour special airing Thursday July 16th, we're going to show a sneak preview of that battle scene!



Those who watch this special will also get a chance to win some big presents!?
The special will air at the TV Tokyo Network Thursday July 16th at 7pm! Don't miss it!



For further information, see TV Tokyo's "2 Hour Pokémon Movie Appear! Special" AniTV site

Source: http://www.pokemon-movie.jp/news/?p=1759