Well, I think you are probably fine now. I had like a Lv 13 charmander and a 12 mankey for the brock fight. Your Bulbasaur should sweep brock with no effort.
Anyway, my favorite character so far is scep, I think. Mostly because he likes flesh because it tastes good. That's like pinnacle or morality for your team, unfortunately. I mean, your other pokemon are actually out to kill just to kill.