Ivysaur's a breed. :I
Plus, birdo isn't part of a breed, is he/she/whatever the heck it is? Doesn't that make things substantially different?
Actually, it's interesting to note that pink was once seen as a definitively boy colour. You know, pink was aggressive, rough, like red. Whereas blue is a calming colour, like a lake on a starry night.
I also just checked. If the devs wanted Ivysaur as a girl in SSBB, you'd think they'd put it in the trophy description. They didn't. TO BE FAIR, they referred to Ivy as 'it', rather than 'he' (or 'she'). Now, you took your birdo argument out of the game description, so if you tell me that the dev saying it means all, then your birdo argument is invalid unless you quote me a time when a dev said it. Even then, it wouldn't necessarily work for Ivy because of Ivy's trophy description.
And anyway, we all know that Birdo is still discovering it's own gender :-P
Comprimise? :3