These are usually Tekken 6 or Tekken 5: Dark Resurrection files that have been modified (reskinned) by fans.
If you are looking for the official, stable experience on the PSP, these are the only titles officially released for the platform: Tekken: Dark Resurrection : An update to and the first entry on the system. tekken 8 psp iso
Modders replace textures, music, and UI elements to make the game look like Tekken 8 . They may add custom character skins that resemble Tekken 8 designs. These are usually Tekken 6 or Tekken 5:
Disclaimer: This article is for educational and informational purposes. Downloading copyrighted ISOs for games you do not own may violate copyright laws in your jurisdiction. Always support the developers by purchasing official copies where available. stable experience on the PSP