The official Pokémon movie website has updated. Translations of the new entry follow:

Pokémon Summer is here! We're Holding the "Become Even Hotter Than Volcanion! Heatburst Campaign"!

The protagonist Pokémon Volcanion plays a major role in "Pokémon the movie XY&Z: Volcanion and the Ingenious Magearna", which premieres Saturday July 16th!!
"Heatburst" Pokémon Volcanion's moves are likewise burning with heated passion! And the same day the movie premieres, Saturday July 16th, a "Become Even Hotter Than Volcanion! Heatburst Campaign" where you can obtain merchandise that makes your passion burn even hotter than Volcanion starts up!

Everybody that spend 1000 yen (including tax) or more at selected merchandise at participating stores will receive a "Heatburst Body Sticker"!
Also, if you send it the "personal entry postcard" you receive with the sticker, you can enter a lottery where you can win all kinds of prizes that will make your passion burn!

What you're guaranteed to receive:
If you spend 1000 yen (including tax) or more at selected merchandise at participating stores, you will receive a "Heatburst Body Sticker"!



What you can also receive via the lottery:
Enter the lottery via this campaign-specific "personal entry postcard" you receive with the "Heatburst Body Sticker"!



Prize A: Take a Hot and Passionate Hot Spring Trip!? 20,000 yens worth of JBT Travel Tickets - 10 winners
Prize B: Volcanion's Heatburst Thermo Bottle - 30 winners
Prize C: Volcanion's Passionate Towel Scarf - 300 winners
Extra Chance Prizes: Volcanion's Bath Salt: "Steam Wat-Eruption - 5000 winners
*The Extra Chance winners will be chosen from those who didn't win prize A-C

Campaign products:



*this image is an example of valid products.

*All Takara Tomy Monster Collection (MonCollé) products
*All Takara Tomy Pokémon toys
*All Pokémon Card Game expansion packs, Pre-built decks, and similar items
*All Nintendo 3DS/Wii U Pokémon series video games

Participating stores:

Apita/Piago, Aeon/Aeon Super Center/Aeon Style/Aeon Retail Store, Ito-Yokado, Edion, Joshin Denki, Toys 'R' Us, Bic Camera, Fuji, Heiwado, Yamada Denki, Yodobashi Camera, Pokémon Center/Pokémon Store
*Some stores exempt
A list of all participating stores is available at the official Pocket Monsters website.

Campaign period:

Distribution period for the "Heatburst Body Sticker" and the "personal entry postcard": Saturday July 16th to Sunday August 21st
*while supplies last

Lottery entry period:

Saturday July 16th to Wednesday August 31st
*going by postdate

For further information, see this page on the official Pocket Monsters website

Sources: http://www.pokemon-movie.jp/news/?p=2198