Can someone help me with my PSP?

I know this might be a noob question but can someone help me in installing a GBA emulator for PSP? I have a Phat with 5.00 m-33 6 cfw. I need to know where to get a reliable emulator for my PSP and how to install it so I can at least play GBA roms on it. I already have the GBA roms. How can I install the emulator? Any help will be greatly appreciated. Thanks!