Where do I get a gba emulator for the ds?

I have an EDGE but i wanna download gameboy games into it.
How do I play the gba games on the EDGE?

Doesn't exist. You need a Slot 2 device. Look on http://gbatemp.net if you want to research.

You need something like an EZ3in-1 slot 2 device. You can buy them off the internet.