For a fully legal path:
official PSP games) modified with custom textures, UI, and character skins to resemble TTT2. Unverified Files: tekken tag tournament 2 ppsspp iso roms download link
If you find the mod too buggy, remember that a legitimate copy of Tekken Tag Tournament 2 is available on modern consoles via backwards compatibility. It runs at 4K on Xbox Series X and is available on the PlayStation Plus Premium streaming service for mobile phones. For a fully legal path: official PSP games)
If you want to play the real game on a computer or high-end mobile device, you must use emulators for the consoles it actually launched on: If you want to play the real game
If you find a community-made TTT2 mod, the typical installation steps are:
Stay safe, respect copyrights, and keep on fighting. The King of Iron Fist Tournament is waiting.