NO$GBA is bad at a lot of things.NO$GBA can emulate local multiplayer, but it's bad at it.
I'm fairly sure the reason StapleButter doesn't provide those files themself is because they're copyrighted material - and as such you can't ask for them here either. Do some searching online to dump your own or just download them if you're that way inclined.Where to download bios7.bin, bios9.bin and firmware.bin? Please give me a link and thanks in advance!
But it's still better than Desmume, in my opinionNO$GBA is bad at a lot of things.