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There hasn't been much of a need for DSi emulation due to it's small library of exclusive games and lack of DSi-enhanced titles that provide anything major besides camera support. The only thing really notable is DSiWare, which saw several exclusive releases.
No$GBA added support for DSi games of all three formats starting with version 2.8, although some games won't boot and others have graphical glitches. You'll need to enable "16MB DSi/retail" under the settings in order to use it. Compatibility is very iffy due to No$GBA's already poor DS emulation, and the camera is just spoofed as a static image and will causes the emulator to crash whenever used, meaning games that uses it may boot, but won't be very playable.
DSi used an encryption system for the game dumps that went on to be enhanced and used for the 3DS. This encryption is checked at start-up, hence why Nintendo DS emulators don't even manage to boot DSiWare dumps. It's very unlikely DSi-mode emulation is ever going to be implemented in DeSmuME in particular due to various creative differences unique to that project.
melonDS recently started attempts at DSi emulation and has been able to boot the system's firmware<ref name="melonDSi">http://melonds.kuribo64.net/comments.php?id=94</ref> and even showed that it can play ''Flipnote Studio''. While still outclassed by No$GBA, it could become the most usable option for DSi emulation in the near future. Most of it is being done using the documentation that the No$GBA devs have already compiled on the subject.
