If you own an actual game cart, you can dump the save file on to the cart useing Rudolph's GBA backup tool http://filetrip.net/f3228-GBA-Backup-Tool-0-21.html
Use this in conjuction with a flashcard and a backwards compatible ds, no linker needed.
If you own an actual game cart, you can dump the save file on to the cart useing Rudolph's GBA backup tool http://filetrip.net/f3228-GBA-Backup-Tool-0-21.html