I came across a download for GTA2 for the PSP. I put it into my GAME150 folder like I do with my other homebrew, but the game doesn't boot, I just get ""The game could not be started (80010002)".
When playing PSX Eboots you have to put it in the GAME folder with the kernel set at 3.XX or 4.XX or 5.XX (Whatever firmware you have) in the Recovery Mode.