well,I said that too. I think its only fair you'll put "edit- sorry I wad wrong" in your first messege about it here to stop misinformation from spreading.
about vc in general. all official games that play on 3ds that arent 3ds, ds(i) or gba are software-emulated. it includes nes, snes, gb, gbc and some that I missed. so they might have inaccurate emulation. its pretty solid tho, nintendo made it themselves after all...
even tho gba vc works on hsrdware it might not be optimal for all games as some require hardware not present on 3ds, like rtc in pokemon. thats why I say its not always recommended.
please, next time ask google before insisting on what you say...