The GBA pack you saw was the 4MB RAM card. The browser uses that for cache and such and cannot work without it. You can definitely get a working rom of the DS game card, but it will never work without the RAM pack. Some DSLinux guys were working on making bigger RAM cards from what I would guess are flashcarts. They could really use more RAM because it would allow them to do more stuff and possibly make a GUI. So, it may be possible to make your flashcart partially or wholly a RAM card, but I don't think this has happened quite yet. And I'm rambling.
No, you can't run a rom of it, it must have the GBA RAM pack.
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