Hey guys, i'm stuck on the keepers of the arena mission. Want to Ad Hoc party and help me out?

In as much as I want to, I don't think so. You need to get passed them alone. I hope you've completely leveled up your ultimate shotlock because you'll need it otherwise you might struggle. Ad hoc won't help you get the new keyblade at the end of the challenge. I have tried it and it didn't work. I recommend for every boss, you use the ultimate shotlock.

Unfortunately, the Ad Hoc party will only work locally, meaning you can't actually play "online" with other players. Sorry! Otherwise I'd definitely help you out.