Your .pnach file must be named exactly according to the game’s CRC code (e.g., 1E7A88A7.pnach for some versions) and placed in the PCSX2 /cheats folder.
To make the game better , avoid the "God Mode" codes.
Instead of modifying code, use PCSX2’s Speedhacks → Enable Turbo (Tab) at 200%. Less risky, same effect.
A dedicated pnach patch exists to fix the notoriously "shoddy" horizontal-inverted camera controls of the original PS2 version, making it play more like a modern third-person title. Movement Speed Multipliers: You can toggle between 5x or 12x movement speed using button combinations like