As I have experience modding NSMBW, too many nodes crash the game when trying to load the model. Depending on the costume, said model would need to be below a certain number of nodes. Now, I don't know if 3DS games handle it differently, but this is true for games like MKWii, Brawl, and NSMBWii.
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Doubt it, and whose Charizard do you have? Mine or SD's? If mine, I know I have the c0x and h0x folders inside of the body folder. If you are using "cachegen" then make sure you repeat the method for everytime you want to take out your sdcard after adding a new file.