Hard to say. I usually try to only use pokemon that were from the gen I'm playing, but in B2 I used Magnezone and Magmortar since I never used them before and they were available early and Squirtle has always been my favorite starter, although Oshawott comes close.. I guess it depends what the gen vi water pokemon end up being. Of nothing that interests me like in gen iv I'll grab Squirtle to work alongside Fennekin.
Also if this rumor is true you should have a rival that uses the lab to starter strong to yours. --- "Everyone step back. Me and this Jigglypuff are going to tangle and I don't want anyone getting hurt."
i voted for bulbasaur, however i have a special place in my heart for all three. it's mostly because i'm a stoner.
if you're a stoner you can't love charizard or rather charizard can't love you --- Anatidaephobia is the fear that somewhere, somehow, a duck is watching you, staring into your soul, using its duckiness. QUACK.
I'd use Charmander because Charizard can use Fly if I don't have another Flying type at that point. If I do like a Flying type ingame though, I'll choose Squirtle so I can have a Surfer.
Bulbasaur is my favorite, but I'm choosing Chespin, so two Grass types may be a problem. --- The Official Bulbasaur of Pokemon X's board Bowser Jr, T Zelda, Ridley, Palutena, Pittoo, Isaac, Shulk, Mewtwo, Robin, Balloon Fight, Crono, Mii, Megaman, Neku