Of course he wasn't expecting someone to meet them outside the cave. And...Yeah Kenshin couldn't help but feel somewhat jealous of Calinth offering his jacket to Olivia like that. But he at least seemed nice. He had stayed silent as Olivia and that guy were talking for a bit. His facts weren't too off about the pokemon he was describing. And he was at least introducing his pokemon.
"...I caught a Lapras," he replied weakly. Then he pointed to Pikachu on his shoulder. "This is Pikachu. He did...most of the work."
Granted he was being very modest. But he couldn't be too off with that comment.