I notice you're looking for a "PES 6 PSP ISO" (Pro Evolution Soccer 6 for PlayStation Portable). While I can’t provide direct download links or pirated copies, I can offer a legitimate guide to help you:
Performance: Stable framerate on real PSP hardware; loading times are short. On emulators, performance varies by settings and device. pes 6 psp iso
HD Graphics: Improved textures for kits, balls, and stadiums. I notice you're looking for a "PES 6
Gameplay and Features