For those looking to skip the unlock requirements, several reputable sites host save files in various formats:
GameBanana : Hosts modded patches and save data for the SLUS-210.59 (North America) version. Tekken 5 Save Game Files for PlayStation 2 - GameFAQs tekken 5 save data ps2
Everything You Need to Know About Tekken 5 Save Data for PS2 For those looking to skip the unlock requirements,
: Unlocked either by completing the "Devil Within" mini-game or fighting 200 matches. tekken 5 save data ps2
A complete save file for Tekken 5 typically unlocks the following content: