All right. I got Kaptain K. Rool's main belt working, but the model screws up when trying to make the skull belt buckle texture transparent using Spex's Transparency tutorial.
I have transparencies on it already, and it works perfect in BB. But in-game, the model stays stuck in the middle of the stage, and in the results screen, his polygons explodes...
This happened to me once. The problem I could find was that I probably exported the materials using a different version of brawlbox from what I used to import them on the other model. Make sure you use the same version. If it continues try a different version of brawlbox.