I can see that once a month and maybe twice a month there should be a chance to battle the Elite Four. The Elite Four would be high staff so Senior Mods and up with 100% IV Pokemon and these Pokemon EVs would be completely EV trained in all stats so HP 252, Attack 252, Defense 252, Special Attack 252, Special Defense 252, and Speed 252. These are the reasons why, so that the Elite Four is actually a challenge, and also so that players can't bring in Semi-Okay IV Legendaries and beat them. Also I can see each Staff member having a team of there very own and each Staff member gets to pick a type of Pokemon... By color instead of actually Pokemon type. These is so that there can be more variety to the Elite Four member's team. This is so if let's say Marco (sorry for picking you Marco) picks Dragon-type he could only pick Dragonite, Kingdra, Salamence, Flygon, Altaria. The picking a Pokemon-type factor can limit some Staff's choice. Now let's say that Marco picks the color Green, he can use Shiny Dragonite, Aura Vaporeon, Shiny Espeon, Halloween Lapras, Venasaur, Megainum, Sceptile, Breloom, etc... the list goes on. The Champion would have to beat the Elite Four and then a tournament would happen or something to determine the Champion of that month.