Each gym leader makes up his or her own rules...as for the tournament, each leader will use the team that they plan on running their gym with...so if you don't plan on using ubers in your gym, and another leader decides to use ubers...you will probably loose and be given a lower spot in the gym...for the simple fact that the higher up in the gym, the tougher it is supposed to be... And like I said, each leader will make their own set of rules when running their gym...I would prefer no hacked pokemon though...that isn't really fair! So, no hacks.