Heres what will be a top emulator for the nintendo 3DS and 2DS, heres the release news:

PicoDrive 3DS v0.91 is released. This is a port of notaz's PicoDrive emulator to the old 3DS and old 2DS. Currently supports Sega Master System and Mega Drive games only. If you want Sega CD and 32X support, Retroarch is your best bet for now.

- Added support for more extensions (.smd, .gen, .bin, .rom).
- Added option to apply a low pass filter to the audio.

PicoDrive features:
- status line in main menu working
- bug fix: remove accidental wip svp code
- analog control working
- bug fix: svp dynarec freeze
- bug fix: load state background
- bug fix: accurate renderer

PicoDrive 3DS Changelog:
First release.