Do you know if it has to be the day or your birthday month?
I don't know if we can ask about in game teams here, but I'll try anyway.
I'm planning on restarting my White version. And I want to use Leavanny & Galvantula, and Emboar & Mienshao. Is there anything wrong with having two bug and two fighting pokemon on my team? I plan for Galvantula to be mainly Electric, Leavanny would be all around, Emboar would be mainly fire, and Mienshao would be mainly fighting. (And there is absolutely no way I'm going to leave Mienshao off my team.)
And just in case, I'm also planning on using a Swanna and a Krookodile.
Is there a fixed amount of times you can battle Cynthia, or is it infinite? I get good EXP., battling her.