Instructions
Power on your Nintendo DS with "Pokemon SoulSilver" inserted, and select the Mystery Gift option from the main menu. You must be standing within the Pokemon Event's Wi-Fi area so your DS console can receive a signal.
Choose the Receive Gift selection once your Nintendo DS connects to the local Wi-Fi signal and use the Get Via Wireless option. The Pokemon will then be downloaded to your "Pokemon SoulSilver" saved game.
Deposit a Pokemon into your PC, to make room for your downloaded Pokemon. You will need one slot out of your party of six empty to redeem your downloaded Pokemon.
Enter a Pokemart location, and talk to the delivery man standing beside the counter. He will give you the Pokemon you downloaded. Save your game once you receive your special downloaded Pokemon, to keep it forever.