I did some quick research and came up with this from the Super Series Rule Book:
Rule 7.01.08 PITCHING LIMITATIONS: Super Series does not have a pitching limitation rule. While Super Series advocates safe and reasonable pitch count limitations for all pitchers, our organization believes such limitations are the responsibility of the player's parents; and also the adult manager and coaches. An organization has no way of accurately knowing how much a player may have pitched in the days prior to a tournament. Therefore, parents are in the best position to make an informed decision regarding the health and safety of their child.
So, there you have it. A rule that indicates that there is no rule.
"Pitch him all you want Dad/Coach; if he gets hurt it's your fault, not ours."
This is the reason pitch count limitations exist; to protect the kids (especially the young ones) from injury by protecting them from the overzealous and irresponsible parents and coaches who want to win, win, win and don't care if they hurt a kid doing it.