Hi, I believe we haven't met before, have we? My name's Davin, it's nice to meet you. :)
I'm someone who tends to hang around the Emulation forum most of the time, and usually researching 4th and 5th generations. I believe someday... if alot of ROM Hackers researched on the ROMs and stuff... they could be able to figure out how to create a Software Development Kit for the NDS, and maybe even one for the GBA or any other console. It would be just so amazing to create your own video game on a particular console or handheld, or even edit them fully. ;)
So far... no one has fully created a proper map editor for the 4th or 5th generation as of yet.