Pokemon in Rainbows...

[Pika-D]

Brown would be Cubone.

Next is Red.

 

[Hikamaru]

Tepig

The Fire Starter for new Trainers in Unova, he's one cute piggy.

Next is Pink

 

[AxeyWaxyWoo]

Slowpoke is very pink! :D And is the cutest thing ever! *Spazzes over the cuteness* ^^

Next colour is...violet.

 

[Hikamaru]

Stunky

That silly little skunk with the dreaded Aftermath ability... don't knock it out with a direct attack or you'll be sorry!

Next is Blue

 

[diab_low]

BLUE

Ivysaur is mostly blue in colour.

Next is Green

 

[gameplayer56]

Green:

Snivy
Just one cute snake Pokemon <3.
Next color: Yellow​

 

[Hikamaru]

Ampharos

We all love this cute Electric Pokemon, don't we?

Next is Brown

 

[yaminokaabii]

Vulpix is brown!

Next poster, give us some red!

 

[NixChill]

Charmelon!
next is orange

 

[alisaie]

Look at the first post. the color Orange isn't used in this game. So let's go to pink!

Igglybuff

And now the next color is Violet

 

[google123]

violet?i would say gothitelle
next color is green

 

[Hikamaru]

Palpitoad

AKA the derpy toad.

Next is Green

@google123 Blue comes after Violet.

 

[diab_low]

Spinarak is green

Next is Yellow

 

[google123]

yellow is jolteon
next is brown