This bot is - as the short description says - really useful if your Discord server is related to Wii games. It offers commands that use the Wiimmfi API (TL;DR Wiimmfi is a Nintendo WFC replacement server, so you can play Wii games online) and the CTGP API for things like Time Trials, Ghost database, etc.
A list of commands can be found by sending
w.help in any channel where the bot has permissions to read and send messages. The help page uses reactions to show the next and previous page, so to get to the next or previous command category, simply react with the corresponding emoji.