I've done the following colors already:
Red & Blue: Red, Blue, Pink
I think these are the only ones that I've completed so far.
As for me personally, I started White on Crystal yesterday, and am 3 badges in as well. I already did White on Blue.
Right now I have Carl the Butterfree and Ace the Togepi. I will add Seel and Smeargle later on.
Carl the Butterfree, ♂ - L25
Confusion, Swift, Harden, Sleep Powder
Ace the Togepi, ♂ - L26 @ Quick Claw
Headbutt, Sweet Kiss, Mud-Slap, Metronome