Bobby Pendragon is the main character of his series and Saint Dane is the main villain. So automatically you would go for the hero right? Well, in this case that’s certainly a valid point. By the end of the series, Bobby Pendragon is immensely “powerful” and a force to be reckoned with. Bobby Pendragon wins.
Saint Dane may have been the main villain of a considerably long book series, but that just won’t cut it against Mewtwo! Mewtwo has his shadow ball attack and his immense power will end this match pretty quickly. Mewtwo is also a lot faster than Saint Dane and he can use this to his advantage. Mewtwo wins.