Save data is region-specific. A save for the Japanese version ( Captain Tsubasa ) will not work with a patched or different region ISO unless converted.
Here are the three proven repositories:
PlayStation2 X-Port Save (Japan) Game Complete 99%, Easily Win Matches, Great Player Levels & Exp. Captain Tsubasa Review for PlayStation 2 - GameFAQs Captain Tsubasa Ps2 Save Data
: Sites often share "All Teams Unlocked" saves specifically for use with PCSX2 emulators or memory card tools like FreeMcBoot. Important Gameplay Mechanics Linked to Saving The game uses a Story Mode Save data is region-specific