You need the game's ROM file and system keys from your own Switch console.
You must own the game on Switch and dump your own system files and game "ROM" (the digital copy) to use with an emulator. Complex Setup: You would need an emulator like or others found in the EmulationOnAndroid community 🥊 Pokémon Fighting Game Alternatives Pokken Tournament Dx Apk Download For Android
It sounds like you came across an article claiming to offer a "Pokkén Tournament DX APK" for Android. I should clarify: was officially released only for Nintendo Switch . There is no legitimate Android version from Bandai Namco or Nintendo. You need the game's ROM file and system
Here are the key facts: