Smaug had told the Buizel of how he didn't trust humans when he met Liam and his friends, including the story about the poacher who had tortured him and his mother when he was a Charmander. He also mentioned how a particular Pokémon [Saisei] however, he was very vague about the identity of the Pokémon who helped him to get over his mistrust of humans. Smaug mentioned that his trainer comes from the same family as the many nurses that work in the Pokémon Centers across the world, and how he, like them do not take it lightly when people mistreat Pokémon. While he personally does not know much about Jen, if Liam trusted her, that was good enough for him.