Growlithe did use fire and could end is fairly quickly, Childermass puts a hand out over where the little dog has fallen back to, at his side.

"Only if it becomes necessary," he answers Zecora, though he doesn't look away from the Pinsir. It's snapping its pincers menacingly and stomping about already, so best to keep an eye on it. "But I believe it was your companion there who was looking for a fight."

So by all means, Lucario can have this one.