I really dont think all the hidden grotto Pokemon has this percent of being female with the exception of Combee which is 5%. I'm been looking for a female Nosepass in the grotto by the entrance to Mistralton Cave since yesterday and I've encountered at least 16 Nosepass and not one was female. I've encountered plenty of female Foongus and Woobat but no Nosepass. I know it's bad luck but I seriously doubt Nosepass has a 30 percent chance of being female.
From: FuneralCake | #002
If you're playing White 2, Nosepass has a 0% chance of being female there.
BlackFC:1807-8830-3725 "Squids are evil!" http://i.imgur.com/VcOip.png Official Zoroark of the Pokemon XY board