What cant ever be....

Indeed that is a sad thought. Why in the games do they not have a gender, I mean you should basically be able to tell what legendary is a Female/Male.

Personally I believe that even though Mewtwo is a boy in the show the Mew he was cloned from was probably a girl, they changed Mewtwo's genetic makeup so I'm sure they took out/added the genes that made him a boy.
And I've always thought of Latios as a boy while Latias is a girl.
But two Pokemon who shouldn't have been both genders in the game is Mr. Mime and Jynx who can either be boy or girl.

Sorry for babbling on and on it's a cute and well drawn picture.