1. The chances for a female starter are 1 in 8 (12.5%) for all three.
2. Powerbracer gives EVs for Pokemon that don't even yield ATK EVs. Pokemon that do yield ATK EV's include: Bellsprout, Krabby, Goldeen, Sentret (Not Furret), Spinarak, Poochyena (Duh ), Shuppet, Shinx, and Snover and all of their evolutions, just to name a few.