If you don't have a modified revo_kart.brsar, simply place the revo_kart.brsar file from this folder into your My Stuff folder and disregard the rest of this guide.

If you have a modified revo_kart.brsar, open it in Brawlbox. At the bottom right, you will be greeted by a set of columns with indices.
Inside of this folder, you will find a lot of .brwsd files. To install these, in brawlbox, go to the index indicated on the left of the file name.
Right click the index in brawlbox and hit 'Replace.' Select the appropriate file, and repeat this for all the .brwsd files.

Index 637 is different since it has the Menu Selection voice clips for all the characters, not just Wario. If you have custom character voice clips
already, then go to Index 637 in Brawlbox. Double click the index. On the bottom left side of the pop-up screen, You will see files called Audio[0], Audio[1], ...
etc. Scroll down in this list to Audio[105]. From Audio[105] to Audio[112] inclusive, right click the audio and hit 'Replace'. Go to folder [637] - Character Selection
and replace the audio clip with the corresponding one. Do this for all voice clips. When you're done, make sure to save the file in Brawlbox.

If you follow this, you should have all of Wario's voice clips replaced with Teddie's.