Now can I show you my pokémon!?
http://www.nintendoworldreport.com/news/35048
Participating GameStop locations will be offering three shiny legendary Pokémon starting in early August.
The Pokémon and dates are as follows:
Players are required to have obtained their Pokédex in game, and they should have no more than 11 Wonder Cards. Eligible games include both Pokémon White/Black and Pokémon White 2/Black 2.
In Canada the event will be held at participating EB Games stores, and the available dates will begin on August 30.