From Bulbanews, your community Pokémon newspaper.
To be distributed after 7-Eleven distribution
The Pokémon that will be distributed via serial code from 7-Eleven Pokémon DS Rally in Japan will also be distributed at Pokémon Center stores in Japan, after the Pokémon DS Rally ends.
Ash's Pikachu, Serena's Pancham, Latios, and Lugia will be distributed at Pokémon Center stores from August 17 to September 13, 2015. Further details about this distribution will be revealed in the future.
The Pokémon DS Rally is an event in which players can collect a virtual stamp from two different 7-Eleven stores to obtain a serial code for a Pokémon. Pikachu and Pancham will be available from July 18 to 31, 2015; Lugia and Latios will be available from August 1 to 16, 2015.