Dolphin Ctrl simulates a GameCube controller and allows you and your friends to play games on the Dolphin emulator using your phones.
Requires running the Dolphin Ctrl Server app on your computer running Dolphin. Download the server and read the instructions at https://github.com/apexskier/dolphin-controller.
Note: Dolphin Controller can be slow depending the speed of your WiFi/bluetooth/remote network connect and the speed of the Dolphin emulator itself.