4th Gen The B button

[Nyjil da Kid]

I'll do it without a doubt! I kept my Turtwig unevolved until it learned Leaf Storm at Victory Road!

On a side note, it swept Volkner's team except for Ambipom...I love that monkey...
So yeah I'll be keeping some Pokes unevolved.

 

[ElementalKrack]

I'm going to pick Cyndaquil (My all time favorite Second Gen. pokemon), and I guess I can wait a few levels until it gets Flamethrower.
So, I will evolve it right away, I might get one Pokemon and just... not let it evolve. Can't wait.

 

[Aro-kun]

Heheheh.....I kinda already don't evolve my pokemon. I do it for an anime kinda experience (Ash never evolved all of his pokemon), and it sometimes makes the game more of a challenge. So I'll be travelin with a level 40+ Bayleef, and Eevee (o.O Eevee is pretty tough un-evolved if you give him the right moves....)

 

[noobiot100]

Well, I wanna be like ash! when he doesn't have fully evolved pokemon most of the time.

 

[JDude151]

It depends on the Pokemon, really...
Since some Pokemon get moves that they can't get at higher evolutions.