Wait...shouldn't Platinum be Crystal and Crystal be Platinum?

[jnfs2014]

Pokemon Pee Version
Pokemon Poop Version
Pokemon Diherrea Version

[Doodle]

Crystal was based around Suicune.
Suicune kind of has the color of Crystal. That's probably why they picked Crystal.

[Shujinco2]

Pokemon INVISIBLE! :O

[JrDude]

Pokémon Shadow and Pokémon Light. 3rd can be Pokémon... Dunno, but I picked shadow and light because the Pokésquad are doing themes now, R/S/E were based off what created the earth, ocean, and sky. D/P/Pt are based off who created time and space. This could be based off who created the light and dark (but since dark is a type, I used shadow).
or maybe the sun and moon, dunno.

[THEEVILSPERKY]

I've got it:  Letters!  Pokemon X, Y, and Z versions!

One version can have only male Pokemon available, the other will only have female, and the third.. well.. the third has both. =P

[The Seventh]

I agree there.

Maybe Poke'mon Uranium, Plutonium, and Hydrogen versions

That would be an explosive generation :D

[phatyo]

Haha your right!