Found off Gamefaqs:
http://pokemon-games.com/portal/mystery/
If you don't feel like playing Pokemon Sudoku, go to profile->profile->self introduction and enter BA16-X4SH-E2AT (with the hyphens). Having entered the code myself, I can confirm it works.
http://pokemon-games.com/portal/mystery/
If you don't feel like playing Pokemon Sudoku, go to profile->profile->self introduction and enter BA16-X4SH-E2AT (with the hyphens). Having entered the code myself, I can confirm it works.