They used that concept in Black/White, Taoism.

If Crayola can keep coming up with new and inventive colors, I think the developers of Pokemon shouldn't have a problem.

Pokemon Burnt Umber

Pokemon Cerulean Blue

Pokemon Ultraviolet/Infrared

Pokemon Chartreuse (Yellow and Green)

Pokemon Pink/Purple

Pokemon Fuchsia

Pokemon Brown...

Okay, so the last one probably wouldn't sell so well.

I like Ultraviolet/Infrared!

I would totally buy and use Pokemon-themed shampoo, even if it was designed only for pets.

LOL. Nintendo would probably give you a Pokemon treat for being such a good boy.

They just need two contradictory elements, really.

Looking forward to Pokemon Earth, Sky and Time, myself.

They could always go for Pokémon Red/Blue Returns or something.

Forget that; I want Pokemon Brown. Starting pokemon: Poomander

I think they are almost out of colors already. I doubt they'll do Orange, Purple, Pink, Brown or Grey. None of those have a good counterpart, and some of them are just boring. I would expect the third game of the fifth generation to be something like Rainbow or Spectrum rather than Grey.

Even though some people are saying "lol dere iz milyuns of colours," we're talking about naming conventions here, not distinct shades viable to the eye. So there really isn't too many options left. Ruby and Sapphire was already like re-using Red and Blue, so I doubt they'll use Crimson or Topaz or Cobalt or whatever. Ultraviolet and Infrared at least is a decent idea.

But in general, I think it makes more sense to stay basic or elemental than to just use more and more colors. Sun/Moon would be better than Mauve/Periwinkle.

Pokemon Topaz / Jade

Pokemon Fiery Red / Slightly leafier Green

Pokemon Facebook / Twitter

Pokemon 82 / -82

Pokemon Toyota / Honda

There's a lot of stuff in the world.