The official "Wii U USB Helper" does not have a stable, native Android version . There was a mobile project called USB Helper GO

Final Score: 8/10 (Utility)

• Downloads from NUS using Android-native HTTP libraries.
• Implements the Wii U encryption/decryption in Kotlin or Rust.
• Handles modern Android scoped storage.

While the original project has been discontinued, you can still find community-maintained versions like the WiiU USB Helper GO Patched APK Download & Install : Download the file and install it on your Android device. Transfer Games to Wii U Install the Wii U Transfer Tool on your console (place it in SD:/wiiu/apps Download your desired game within the Android app. Launch the Homebrew Launcher and start the Transfer Tool on your Wii U.

• You download Wii U games on your PC using USB Helper.
• You convert them to a format that a specific emulator (like Dolphin for GameCube/Wii – not Wii U) requires. But Wii U emulation on Android is virtually nonexistent today. So this use case is invalid.

Wii U USB Helper Android: A Comprehensive Guide