Depending on how you are playing the game, the process for importing data varies:
: Ensure your downloaded save file matches this ID prefix. A save file modified or labeled for a different regional hack will register as "Corrupted" or will not be recognized by the game disc. Captain Tsubasa Ps2 Save Data
For a visual guide on setting up save data and patch codes for the AetherSX2 emulator, check out this tutorial: Depending on how you are playing the game,