just as the title says, what is the best flashcart to emulate GBA, NDS roms on 3DS console.
this one r4i gold 3ds: http://www.dsflashcart.com/r4i-gold-...3ds-p-248.html
if you want to play gba games on 3ds console, the only option is to buy a supercard dstwo card, dstwo can play gba games without slot 2, so it can play gba games on the 3ds console with the dstwo plug in.
If you only want to play ds games, r4i gold 3ds is the best and cheap card for you. it is working great on the latest 3ds V6.2.0-12 and this card has very good compatibility. you can play all the ds games with the r4i gold 3ds.
there are also some other cards, such as r4i sdhc 3ds, r4i gold pro, ace3ds plus, all of them are only playing ds games.
And another, if you want to play 3ds games, you need to buy the gateway 3ds card. but this card currently can only work on V4.5 or lower version 3ds.