How did you do the Emerald Mewtwo? I've been trying to make Emeralds for my PSAs, with no luck.
The easiest way is copying over the materials and shaders from a Brawl emerald character, which are the ones with the 'Dark' word (like FitMarioDark). That should give you at least most of the emerald character. There's sometimes parts that need special edits, like eyes or fur, but in general this would be it.
They won't get the changing color unless they're loaded from the 'Dark' costume, though. I'll make a version of this Mewtwo that's green in normal slots, you can copy over the materials from that one when released if needed.