Due to Apple's restrictions, you cannot get PPSSPP from the App Store. You must use AltStore or sideload it. This requires a computer.
: This is the most common way to "play" the series' tag mechanics on PPSSPP. Developers in the modding community have created extensive "Tag 2" mods for Download Tekken Tag Tournament For Ppsspp
Open PPSSPP, navigate to the folder where you saved the ISO, and tap the Tekken Tag icon to start playing. System Requirements for Android Due to Apple's restrictions, you cannot get PPSSPP