There is no official version of Tekken Tag Tournament 2 for the PlayStation Portable (PSP). Any "ISO" or "ROM" files claiming to be a native port are typically fan-made mods based on the engine of Tekken 6. Official Tekken Titles on PSP
"Tekken Tag Tournament 2 (PSP) – ISO / ROM"
If you want a legit handheld version of TTT2, it’s available for PlayStation Vita (via backwards compatibility from digital PS Store, no longer officially sold) or on Wii U. For emulation, the PS3 or Xbox 360 versions work on PC via RPCS3 or Xenia.
Introduction
(PSP): The most advanced official Tekken game for the PSP. It features a large roster and high-quality graphics for the handheld. Tekken 5: Dark Resurrection (PSP)
