This is where a save file like the comes in handy. It gives you a massive head start on rosters, attributes, and unlockables.
To use this file in PCSX2, you must place it in the correct directory and assign it to a memory card slot: How to Import Save Files on PCSX2 - Full Guide
, often used to bypass the need to unlock all characters and arenas manually. How to Use the Memory Card File
Using the save is simple: