"That's impressive, though. Taking down a Legendary... I have to admit I'm a little jealous," he said with a small smile. "But, I can imagine it'd be incredibly frustrating too. There's no rule against it, so he couldn't be disqualified, if he caught them and proved his strength to them, he can battle with them... but it's still kind of a cheap tactic."

He blinked, listening to the explanation, looking impressed, but mostly surprised.
"... you make a habit of travelling with Gym Leaders?"

Between Brock and these two, it's starting to sound a little much to be a coincidence.