Someone skilled in martial arts, and who possibly taught it to their companion. Either the Pokemon had surpassed their trainer or the trainer was significantly weakened due to the strangeness of this place. It hardly matter as the battle was now over and his hunch had been right - the trainer would have lost if the match had continued.

Unlike the rest of the crowd Itachi does not disperse and instead took a couple of steps forward. "Your Pokemon is quite skilled."