There is a special feature in Pokémon Emerald which allows you to get a special Box Wallpaper. You need to be a member of the Pokémon Fan Club and go to their website, input your Trainer ID and you'll get a name. Go to this house in Rustboro and go to the top floor | |
Talk to the guy standing near his Daughter & Her PokéDolls and he will give you the chance to fill in a code | |
Fill it in Correctly and he'll tell his Daughter and then talk to you again and he'll tell you about the new Box Paper | |
Go to the Box and select the new option. There is only one known Paper as of yet, When more are known, they'll be added here |