I was on the toys r us site and this is what i found in the promotions section
Nintendo and Toys R Us are offering Pokemon fans the opportunity to receive the legendary Pokemon Darkrai character for a limited time on their Nintendo DS, between 30 October and 9 November.
All Pokemon fans need to do is bring their Pokemon Diamond or Pearl Game, along with their Nintendo DS, to any Toys "R" Us store during the special Darkrai period. Just make your way our special Wi-Fi download zone in-store and follow the simple instructions ~ then the Darkrai character will be transferred into your game for free! Fans will need to ensure they have obtained the Pokedex in their copy of Pokemon Diamond or Pokemon Pearl.
The mysterious Darkrai, known for its ability to lull people to sleep and cause nightmares, is also the star of the latest movie, Pokemon: The Rise of Darkrai, available 5 November on DVD. Other Pokemon product, including the Pokemon Trading Card Game, will also be available during the promotion period.
Get Darkrai, one of the most mysterious and sought after Pokemon ever, at Toys R Us from 30 October to 9 November.