Wanting to play Mario Kart Wii online but I lost my disc 2 months ago 
I dont think you can use WiiLink but I know you can use wiiimfly (spelled it wrong sorry)
You totally can, but it’s a bit of a faff. You have to manually edit the code files USB Loader GX downloads to add the gecko text codes from https://wfc.wiilink24.com.
Also just a reminder that playing copies of games you don’t own is piracy and is illegal, please don’t do that.