Ah! [...] Wait, what? When?

[god anyway, he's only half paying attention, giving arcanine all the attention, laughing at how delighted it is. what a good boy... mightyena gets a little jealous and barks, trotting over to shove its snout into blue's hands.]

I don't know. He might've been to Kalos to train. I taught it to myself. Maybe he did the same. You'd have to ask.