FrodoDS is an amazing emulator for the DS, plays my Maniac Mansion and Boulderdash flawlessly, it requires you fetch a few utilities together to compile and inject your roms. I simply bundled everything needed together and made a ZIP file with all you need.
[UPDATE #1 This is just the first of many emulators I am bundling together for the utlimate DS Emu pack based off my experience with them all using the M3 Lite Professional, which I assume will be the same for most flash carts unless there are specific builds. I also am considering bundling all together with a neat frontend to handle all your injections and what not, been a while since I fired up that Visual Basic 6 Pro but if anybody else wants to go ahead and help me out, contact me at email@example.com. Thank you!]