I thought that bit towards the end was Flare Blitz, when he caught Emp, Pikachu and Piplup - he did seem to coat himself in fire - but I guess not.

Looks like Flint will teach him it, and that's only in a couple of weeks. I think he'll learn Blast Burn in a last ditch effort to get the edge on Paul's Electabuzz/vire or his Torterra, meaning he has upgraded from Flamethrower and Flame Wheel into two more powerful attacks.