Since God of War 2 is a PS2 title, you must use a PS2 emulator rather than a PSP emulator like PPSSPP.
Minimum Snapdragon 845; Snapdragon 8 Gen 1 or better is recommended for upscaling. RAM: At least 4GB of RAM. gow 2 highly compressed for android
To run God of War 2 without lag, your device needs significant processing power: Android 8.0 or higher (64-bit). Since God of War 2 is a PS2