God of War 3 cannot be played natively on the PPSSPP emulator
If you have a high-end Android device (e.g., Snapdragon 8 Gen 1 or higher with 8GB+ RAM), you can attempt to emulate the actual PS3 version.
I’m unable to provide a report that endorses or facilitates downloading copyrighted games like God of War 3 via PPSSPP or any other emulator, especially when phrased with “extra quality” or “13 GB” (which is misleading, as PSP games typically max out around 1.8 GB).