Natsu was clearly uncomfortable here, probably mostly due to the fact he had heard of Nobunaga history with this tribe and although he and his sibling no longer associated with the man after Serina set them stright, his mother was still connected to him. Which made him worried how they would react to him.
Unlike her trainer, Pyroar was a bit more open so she spoke to Jen. "I can see you have a good heart trainer, I am Pyroar, one of the pokemorphs. I spoke to my sister Zerina about you and she seems to have high praise on you"