Haha, well, I am a Breeder so I can attest to the fact that he has at least once out of my Mismagius. Sadly, Aku's habit of not sticking to his own species with his serenades hasn't gifted him with more offspring. [That last part was a joke, they've actually been monitoring the Pokemon in their party so accidental eggs don't happen again.]

I think, in all seriousness, he's a little shy too about his singing, he's never done a public performance before. Heck, only our group even knows about it or has heard it.