The Main site says you have to talk to him several days.
I only found 1 hiker in the hotels. He said something about Kalos being not bad.
So I suspect that's the one and what he tells you changes a little with each visit kind of like the Backpacker that gives you the strange souvenir.
Okay but I already now I have to talk to him for several days. I can't find him to start talking to him.