A: Not possible. Native PS3 emulation on Android does not exist. Cloud streaming via PlayStation Plus or GeForce Now is the only way to play it on mobile.
If you have a Netflix-style subscription, check PlayStation Plus Premium. The original God of War III is available for cloud streaming on PC and console as part of the service. Remember: Kratos has moved on to Norse mythology in the 2018 and 2022 games. But his Greek rampage is timeless—just play it legally to avoid your own "rage of the gods" from malware. God of War III ROM -ISO- Download per Sony Play...
For 99% of players, the on PS4/PS5 is the superior experience. It offers a native 1080p/60fps performance that no emulator can currently match without stuttering. If you are a die-hard PC enthusiast with a legal backup of your original disc, RPCS3 is a fascinating technical project. A: Not possible