http://buildbot.libretro.com/nightly/nintendo/3ds/
So far, the Cores include:
2048
CatSFC
FCEumm
Gambatte
Genesis Plus GX
GPSP
MednafenVB
NXEngine
PicoDrive
SNES9XNext
It should be noted that most of the Emus will work better on the N3DS due to the O3DS being less able to run them.
Edit: If you want the so far best RetroArch Cores that run great as .cia, grab this Build, and Install:
http://buildbot.libretro.com/nightly/ni ... troArch.7z
FCEUmm
CATSFC
Gambatte
gpSP (Some Roms crash/not work. SSF2TR (Eur) being one of them)
Genesis+GX (Some Roms might not work like some Sega CDs for that, Install....)
PicoDrive (for the above and this, place CD BIOS in SD//retroarch/Cores/System/ and follow the following
Genesis Plus GX supports usage of actual BIOS image files rather than emulating them. Only Sega CD/Mega CD emulation requires a real BIOS to work. It is recommended to use a BIOS from a Model 1 system, but other are expected to work too.
bios_CD_E.bin (MegaCD EU BIOS)
bios_CD_U.bin (SegaCD US BIOS)
bios_CD_J.bin (MegaCD JP BIOS)
bios_E.sms (MasterSystem EU BIOS)
bios_U.sms (MasterSystem US BIOS)
bios_J.sms (MasterSystem JP BIOS)
bios.gg (GameGear BIOS)
sk.bin (Sonic & Knuckles (2 MiB) ROM)
sk2chip.bin (Sonic & Knuckles UPMEM (256 KiB) ROM)
areplay.bin (Action Replay (Pro) ROM)
ggenie.bin (Game Genie ROM)
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