PCSX2 Player vs Player (Offline or Online)

Hi guys. I recently recovered this gem and played it from pcsx2. After completing the story. I continues to experiment and I was wondering if it's possible to play with two people offline, for example if I can have the second player enter my save or if the second player must also have a save on the game. Can you kindly explain to me how to play this way, i.e. player vs player, both offline and online?