Hello, the starters?! xD
All of the starters are overused (amongst my friends, at least), and they rarely give the other Pokemon a chance. Power-leveling isn't going to be the best idea, y'know?
I would spend hours trying to convince them that a well-rounded team is better than one with a Level 100 starter, and everything else at Level 20. It just doesn't make sense. *shakes head*