It's a wrong post on the wrong board (because TC is asking a DS question). But I'll answer it though.
No$GBA:
Edit No$GBA.ini with Notepad
Replace keyword Compressed into Raw
Restart the game then the save is automatically converted
DeSMUme:
Open the game - File - Export backup memory - Done
BTW, you can't play DS game with Gateway Red Card.
You should play them in Blue Card.