Ensure you have the USA or Europe ISO . The Japanese version often has different balance patches. Ensure it is labeled as "Full ISO" (approx 1.1 GB - 1.6 GB) to ensure cutscenes and audio are not compressed.
Since there is no official TTT2 for PSP, developers in the homebrew community took matters into their own hands. Using Tekken 6 (which did have an excellent PSP port) as a base engine, modders began extracting character models, stages, and moveset data from the console version of TTT2 and injecting them into Tekken 6’s PSP framework. tekken tag tournament 2 psp iso roms better