Bandai Namco has never released an official port of Tekken Tag Tournament 2 for Android or iOS. Unlike Tekken 6 (which had a Java-based mobile version years ago) or the modern Tekken Mobile (which was shut down in 2019), TTT2 remains exclusive to home consoles and arcades.
This is an emulator for the Wii U. You can install the emulator and run the Wii U ROM of Tekken Tag Tournament 2
The vast majority of “Tekken Tag Tournament 2 APK” downloads are:
If you want a native mobile fighting game, the official TEKKEN Mobile was the closest official experience, though its servers have since shut down. For Tag 2 , your best bet is using the with a "TTT2 Mod" for stability, or a high-end Cemu emulator setup if you have a powerful device.
AetherSX2 development has slowed, but the last stable build works well for TTT1.