"Pokémon players are invited to bring their Nintendo DS systems and Pokémon® Diamond or Pokémon® Pearl games to the nearest GameStop store where they can receive Deoxys™, a legendary character with transformative powers and an impressive set of battle-ready moves."
Here are some other links with further information:
Free Rare Pokemon Download at GameStop
Deoxys Coming To Gamestop
I would advise you to call your local GameStop to make sure they are offering this event and to find out further information.
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