I think you're the same person as on PocketHeaven, but I'll post it here as well just to be doubly sure. SnezziDS requires cards with GBA compatibility in order to run. It actually ends in *.ds.gba, not *.gba, indicating that it's a DS binary you can just rename to *.nds if you want, though it will still only run on slot-2 cards with GBA compatibility.
SNEmulDS however runs on all devices and can load large games using a paging system. If you can figure out how to use that, it would be a better option.
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