I'm sure you know who the guy is, and as obnoxious as he is, He was right all along.

There's blatant evidence surrounding this, But due to Go.odra's feminine looks, and strong gender profession in the species, It's confirmed that Ash's Go.odra is female. When she was a Goomy, she had a very effeminate attitude towards Ash and Dedenne. Dedenne is male, and this sums things up perfectly.

Also take into account that Iris is a girl with a male pseudo, Dragonite in this case. Ash is only going to be this in reverse, male trainer with a female pseudo, Go.odra in this case. I'm personally glad as I would've hated to see it as a male.