Expand the MDL0, and expand the Materials folder; see if you can expand each material. If not, that means that there are no textures attached to the materials, and this is super easy to fix.(This is something that happens with Blender importing, too) Go to a Brawl fighter, expand the MDL0, expand the Materials folder, and export a material. Make sure that either it's a material with only one texture being referenced, or, if you want to actually use a reflective material, use one from your choice of what kind of reflection you want(For example, Samus' reflection looks entirely different from Sonic's reflection on his fur) Now go back to the Pokemon model, and back to the Materials folder, and right-click->Replace all of the materials with the one that you exported. (This sentence is optional)Expand these materials, and, for each material, rename what texture is assigned to the material to whatever you want to name it to. Now go into the Textures part(Where the actual textures are located, in the other BRRES), delete any existing textures and/or palettes, and right-click the BRRES and click Import->Texture, select the textures of the Pokemon model that you want to import, and rename them to the corresponding materials. Now the model should have the textures attached to it.
I meant the bones. How do you fix that?