Actually, the funny thing about that is that Mewtwo2000 is rim lighting all the Brawl characters while the only others doing rim lightning are some of people who import and the that retexture project, Smash 3. It doesn't even come close to the Shadows considering how uncommon it still is.
i did my own rim lit charizard for my own radioactive texture before rim lit charizard existed, NOT FUN, only used rim lighting to make it seem like he is glowing, then just released the regular texture because i figured i have it. Double whammy, rim lit and over saturated in a bright color ;^) but the texture took a long time because i had to do alot of filter work, freehand coloring, burning tool and so on, also did eyes and eye lids.