This is a frequently updated database containing cheats for thousands of PSP games, including Tekken 6. You can download the cheat.db file here GameHacking.org:
Only if you absolutely understand the platform (PSP/PPSSPP), have custom firmware or an emulator, and you source the file from a trustworthy, curated repository – never from a random SEO-spammed download site. Tekken 6 Cheat.db File Download
"You need a specific cheat.db version for Tekken 6 on PS3." Fact: PS3 does not use .db files. Anyone selling or promoting this is scamming. This is a frequently updated database containing cheats