Look for the "PS2 Redump" collections. These are the most reliable, bit-perfect copies of the original discs.
Downloading highly compressed ISO files for God of War II (GOW 2) god of war 2 ps2 iso highly compressed free better work
You will need a PS2 BIOS file to run the game, which must be sourced separately from a real PS2 console. Look for the "PS2 Redump" collections
This is a compressed ISO format specifically for emulators. It can reduce the 8GB size to roughly choose one of these:
If you’d like help setting up PCSX2 with a legally obtained game or finding where to buy a used disc, I can provide that guidance.
If you want legal alternatives, choose one of these: