How do you play a Game Boy game on the DS?
Viewing post in Elsie's Out of Potions comments
There are several guides online + youtube, I didn't need to buy a flashcart. Just a formatted SD card with several utilities. I also used a Japanese DSi as these were much cheaper on ebay (~$45). Guide: https://dsi.cfw.guide/launching-the-exploit.html
I think there were a few buffer overflow exploits available but i definitely used the camera one. Also I think the emulator is a port of mGBA. I had some problems with the SNES emulator but no issues with the gb/gba one. hope this helps