(You require a Wii/WiiU to be near your PC and the sensor bar to be below/above your monitor)

(You also require Bluetooth)

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Step 1,  Make sure to have the same roms.

Step 2,  Right click the Bluetooth icon and press Add a Bluetooth Device.

Step 3,  Press 1 and 2 at the same time on your Wiimote.

Step 4,  Add the device (Should say something like Nintendo RVL-CNT-01).

Step 5,  If it asks you for a password, just press Next without typing anything.

Step 6,  In your Dolphin Emulator Controller Settings, set Wii Remote 1 to Real Wii Remote.

Step 7,  Go to the Dolphin Emulator Config and in the Wii section, set your Sensor Bar position.

Step 8,  Turn on the Wii/WiiU.
Step 9,  Open NetPlay in Dolphin Emulator (Tools >> Start Netplay...).

Step 10, Enter the host's IP Address (Or use LogMeIn Hamachi) and press Connect.

 

(if the host is using cheats, make sure you are using the same ones)