Wario use two different bonesets for his costumes: One for normal Wario, and another one for WarioWare Wario. Using a mod with the wrong boneset on a wrong skin, say, for example a mod based off of normal Wario being used over WarioWare Wario, will freeze the game. Try changing which skin your mod(s) are replacing!
Maybe that was the problem. I wanted the Overalls Wario to go over Warioware Wario, so I renamed FitWario06 to 00. Thanks for telling me that. Really appreciate the help with it.
Oh, and about Riivolution damaging the Wii/the Gamedisc, I heard about that as far back as September 2011, which was when I began going into Brawl Modding.