Wii Network Guide
Since 3.5-2143, Wii games running in Dolphin can now connect to the network in order to play online with other Dolphin users but also Wii users. This requires a few steps to setup: for copyright reasons, we can't distribute with Dolphin some of the files that are required to connect to the Nintendo WFC network. However, these files can be acquired from an official source by following this guide.