>>12462676There are 649+ pokémon, chances are a lot of them are going to have the same colour
That said, some colours are extremely underused, like black and white shinies are rare as fuck. The only white shinies that come to mind that weren't originally white are Victini and Glaceon, and the only black one I can think of is Charizard. Then again my memory is shit. Shinies like Garchomp are the absolute worst.
purple > baby shit green