It sounds like you’re looking for a complete guide or essay on running God of War (the PSP version, God of War: Chains of Olympus or Ghost of Sparta ) via the PPSSPP emulator on an Android device, specifically involving ROMs in .zip format.

Use this app to extract the ISO from the ZIP file if it arrives compressed. Best Settings for Smooth Gameplay

Downloading copyrighted PSP games you don’t own is illegal in many regions. Only proceed if you’ve dumped your own legally purchased UMD copy.