Instructions
Open your Pokemon Menu, and write down your five-digit Pokemon Trainer number. The number is found on the top of your Pokemon Trainer ID card.
Visit the Pokemon website Filb.de. This site contains a code generator that can help you determine your unique four-word codes.
Enter your Trainer ID in the text box. Select "SoulSilver" as your game and "English Version" as your Language. Press the Send button. You will be given your four-word codes for all eight wallpapers and three eggs available from Primo.
Travel to Violet City in the game. Talk to Primo in the Pokemon Center, and begin telling him your codes.
Locate each word in your four-word code from the menu. If you tap a letter of the alphabet, you can browse for words alphabetically. Select the first two words and confirm, then select the next two words and confirm. If entered properly in the correct order, you will receive the wallpaper or egg associated with the code from Primo. Repeat this step until you have all the available items.