Be warned, Masters Battle gets a LOT harder than Joe. Go all out on IV breeding and EV training for your pokemon on your DS game(s) before you come here. On sets 4 and 8, I'd strongly recommend packing well trained OU/Uber pokemon for your first attempts at them. Even with Ubers, you need to know how to use them to get past just the regular trainers in there, never mind the colosseum masters.You know with some colosseums once you completed Stargazer you battle 'em again? Well, that's what happened with stargazer. And who's the boss? THE BOSS O' GATEWAY!!!! And don't think for a second he has gateway's pokemon! OH no, he has ones that are 5 TIMES as hard as Gateway. He tore my team apart 15 TIMES (GASP!) before I beat him.