GBA Roms for NDS

Hey guyss. I wanna ask for help..
I want to play gba games in may nds.So, which is better.. Is it Supercard or G6??

Which Supercard are you talking about? There are 3 kinds: Supercard DS ONE for Slot 1 and MiniSD and SD for Slot 2.

...Slot 2...

There are again two for slot 2, MiniSD and SD.

From my investigations, the M3 Perfect is the best slot2 card.The Supercard slot2's have nasty slowdown in many games. I should know, I have an SCminiSD and I wish I would have bought an M3 Perfect instead.Some people may suggest the EZFlash 3in1, but I don't like how it uses the slot1 card's memory for storage. I like to have separate storage space for the GBA stuff.

Yeah I've heard M3 Perfect is pretty good but I don't know for myself. Just look at gbatemp.net (don't need an account now to access pages) and go to reviews, scroll down to the Slot 2 section and click one. There are long reviews for each one so find out the pros and cons of them.

Mini SD or SD is not a problem..These two, can it play gba roms??

Yes since they're Slot 2 carts. Don't know about compatibility though, check gbatemp.net then reviews.

is it even possible to run GBA games off a Slot-1 DS cart? R4/M3 being my example i guess

yes, it is, as long as you find and put a gba emulator for nds in your memory card. i would advise lameboy. it's said to be the best gba emulator for nds.

not off an R4, only off devices that used the gameboy slot.

Lameboy is a GB/GBC emulator.