D because if Charizard is deemed suitable to have "Firefly Light" based on its fiery tail, I don't see why the likes of Infernape, Magmar (->Magmortar), Moltres, etc. shouldn't get it. If they all get it, Charizard gets outclassed and the others become nearly broken; if they don't, we're left wondering what makes Charizard's tail so special that it gets Tail Glow. Best just restrict Tail Glow and blame the localisers for its localised name.
Dunno about Shell Smash, but Blastoise at the very least should get Curse again.