Downloading GBA games for NDS chip??

I was trying to download Pokemon Leaf Green to save onto a NDS Edge chip. Can I do this, beause it didn't seem to work.

You cant run GBA games without a slot2-device. If you have the money buy EZ3in1 and you should be able to run GBA-games from your Edge-card. And if the games arent showing in any list on your card, theres a .gba-.nds-converter somewhere on the internet (but you still need EZ)

No. EDGE is a Slot 1 device, which uses that portion of hardware.