MCD001.ps2 file is a virtual memory card image for the emulator that contains an updated database of cheats for the Codebreaker
Have a working download link or a newer database? Share it on the PCSX2 Reddit or forums — the emulation community thrives on collaboration.
The first place to check for an updated list of compatible games is the official PCSX2 website. They often have a section dedicated to game compatibility.
CodeBreaker itself is proprietary software. Distributing the full .iso is copyright infringement. However, (no copyrighted code) exist in a gray area and are widely shared for preservation and emulation.