The official Pokémon movie website has updated. Our initial article on thie 7-Eleven Campaign is available here. Full details of Serena's Yancham and Satoshi's Pikachu have been added to our Event Database. Translations follow:

The 7-Eleven Pokémon Campaign is currently running!

Summer means Pokémon! And this summer, 7-Eleven is running a Pokémon campaign all across Japan, too!

Part 1 of the campaign: Visit 2 7-Eleven stores to get 1 Pokémon in the "Pokémon DS Rally"!

Take your DS to the stores! If you use the 7-Spot at two stores, you'll receive one of the Pokémon that play a major part in the movie!
During the first period, which runs from Saturday July 18th, you can receive either Satoshi's Pikachu or Serena's Yancham!
Serena's Yancham holds the "Black Glasses" item!
During the first period, which runs from Saturday August 1st, you can receive either Lugia or Latios!
These two Pokémon play a major part in "The Archdjinni of Rings: Hoopa", working together with Satoshi!



Part 2 of the campaign: Purchase two rice balls
The first 200 at each store to buy any combination of two specially marked items, including rice balls, Pokémon-related products (including the special Boxed Pokémon Lunch) will receive special 7-Eleven-exclusive metal keychain charms!
There are two different charms in all: "Magician Pikachu" and "Summer Festival Pikachu"!
*The campaign runs until supplies are exhausted.



Part 3 of the campaign: Purchase specially marked items and win prizes

There's more: If you purchase specially marked items, including deep-fried food, frankfurters, Pokémon-related products (including the special Boxed Pokémon Lunch) for a total of more than 200 yen (tax included), a serial number worth one point will be printed on your receipt! Once you've collected two points, you can turn these in at our special site for an entry in a lottery where 300 winners will receive a special 7-Eleven-exclusive Pikachu plushie! 150 of each variant will be given out!
The plushies also come in the two "Magician Pikachu" and "Summer Festival Pikachu" variants!
The lottery can be entered between July 18th and August 16th! Collect points and enter!

For further information see 7-Eleven's website

Source: http://www.pokemon-movie.jp/news/?p=1858