Tekken Tag Tournament 2 on PSP: The Ultimate ISO Experience was never officially released for the Sony PlayStation Portable (PSP). While the official title graced arcades, the PlayStation 3, Xbox 360, and Wii U, PSP enthusiasts have kept the dream alive through highly sophisticated fan-made modifications and ISO ROMs based on the existing Tekken 6 engine.
Any "PSP ISO" or "ROM" labeled as Tekken Tag Tournament 2 is actually a fan-made mod, typically built using the engine for PSP as a base. Understanding "Tekken Tag 2 PSP" ISOs
: If you specifically want the "Tag 2" look on PSP, search for the "Tekken 6 TTT2 Mod"
: Highly regarded for its smooth gameplay and content on the PSP.