Summoner (PS2) Has No Cheat Code System — Use Guides Instead

You can't. Summoner on PS2 has no built-in cheat code system. The game does not support cheat entry via menus, button combinations, or external devices like Gameshark/Action Replay in any official capacity.

Alternatives for a Smoother Experience

• Walkthroughs & Guides: Sites like GameFAQs offer detailed strategies for tough sections.
• Experiment with Builds: The game allows character customization—try different skill allocations and equipment loadouts.
• Adjust Difficulty: If available, lower the difficulty setting.

Enjoy the journey through Medeva the way the developers intended!