Due to the age of the game (2005), official Konami servers are long gone. However, the community has preserved save files across several archives:
Communities like r/PPSSPP and r/PSP are excellent resources. Search these subreddits for "PES 5 option file" or "PES 5 save data" to find community-verified Google Drive or MediaFire download links. How to Install Save Data on a Physical PSP pes 5 psp save data link