Can desmume connect to wireless to trade pokemon with yourself?

I'm trying to trade Pokemon between Black and White on Desmume Wifi-capable. For some reason I cannot get the emulator to connect to a network so I can use the global trading or any of the wireless features in the games.

I've followed video tutorials but the emulator still won't connect. What steps are needed to get a connection so that I can trade between the two games?

Are you trying to trade between two instances of emulator or emulator and the handheld? You can try https://www.pokecheck.org/ or if you google around, it's possible to find a downloadable GTS emulator (it's called fakeGTS), but I'm not sure if it's allowed to link to it here.