Dokapon Kingdom: "Netplay has desynced. There is no way to recover from this."

[JMC47]

According to a recent issue report, some setups have it working. If anything, the netplay is desyncing regardless, but Wiimotes are so tight over netplay that they can detect desyncs. This means that even without the Wiimote plugged in, your emulators are not perfectly synced. Try playing a Wiigame that actually lets you use GC controllers and see if it is synchronized. if it isn't, then that's why you're getting the message.