There is no code it just depends on your ID number and you have to tell her a name. You get nothing good out of it though. All you get is a thank you and a new wallpaper for your PC hope this helped.
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You can go the website, Flib and it will contain a secret code generator. Use this to get some secret codes and then tell the code to the girl's father. The father will then create a wallpaper for you.
To get the code, go to the website http://www.filb.de/games/gba/emerald/word.php. Then, type your Trainer ID and choose the box paper you want.
To the Rustboro girl,you will need to say a big code.Search in google:"Pokemon Emerald Secret Word Generator"
You get HM01 (cut) in Rustboro City. There'll be a man and a girl in the house the man gives you cut.
the bonus code is sick