I guess that's relative to shadows, but not in this game. I mean, some texture in the original game is messing up the whole thing when played in brawl. It should be easy to remove that shadow-related texture by changing the type to 3 to that single material, in materials1. The change can't be seen in brawlbox, but if you find which's the model/material in there, then you should be able to find and fix the problem.
You can also send me the file so I can take it a look.
Thanks a lot, I'll try that. I have a download link in the OP, but I'm going to try to fix it, and if I can't, your help would be greatly appreciated.
Edit: I can't find a way to fix it, I would love your help.