NES and GBC will work fine on any flash cart your DS can load, and I believe some can take advantage of the built-in GBA hardware (on the ones with a GBA slot). For the 3DS though, getting Snes or GBA working at all is gonna take the Supercard DSTWO.
"I think that the problem with this video is it is highly derivative of many popular bands within the genre. Although when viewed on its own merits, it does have a deeper groove. However what it has in groove, it lacks in originality. One can't help but be reminded of such bands as Pearl Jam, White Zombie, Suicidal Tendencies and other bands that bear the mantle of so called "Alternative Rock". One is even reminded of Lorie Anderson when she wore curlers. Hehehmhm! This video speaks less to the heart and more to the sphincter. In closing, I think Korn would do well to learn more from -"