Shiny Pichu Download at Gamestop
Pokemon.com has announced that players with Diamond, Pearl, or Platinum will be able to download a special shiny Pichu, “Pikachu-Colored Pichu,” from January 30th to February 14th at Gamestop. When traded to HeartGold or SoulSilver, you can take the Pichu to Ilex Forest where another Pichu, “Spiky-Eared Pichu,” will join your party and become one of your Pokemon.
Once you obtain Spiky-Eared Pichu, you will find out it cannot evolve into Pikachu or be traded. According to Professor Elm, the Pichu has traveled through time with Celebi for far too long, which is why its ear is spiky. He calls all the Pokemon Centers and tells them not to allow it to be traded, and therefore it cannot leave the game (though the real reason is probably due to its unique sprite, which past games do not have in their data).
If they are the same as their Japanese counterparts, the shiny Pichu from Gamestop will know Charge, Volt Tackle, Endeavor, and Endure while the Spiky-Eared Pichu from HGSS will have Volt Tackle, Helping Hand, Swagger, and Pain Split.