[A newcomer in Goldenrod, with a Pokemon predisposed to stealing things?

Well, this couldn't be more obvious. But Ilya's just going to file that information away for later. Right now, it's time to troll. By filming her right hand as she answers.

Hey, he said "show of hands".]

My Pokemon prefer to cause damage more than steal things, but they can all be little or not-so-little troublemakers, depending on how you train them. Consider it incentive.