Hmm... Though the games, which are the only things that touch upon this, say Shaymin is a neuter, they say that about all legendary pokemon. So, you may be right. Either way, I'll be refering to Mynh as a he.
@Aspie: Um... That's kind of the point of gender dude. But I get what you're saying.
Earthworms are hermaphrodites they have both male and female sex organs which means that they would be classified by some as not having a gender. There is also such a thing as Asexual reproduction among some species of wasps and ants.
The above has a link that I hope you can get to.