Apart from Weenie (Rabid Ditto3 8) I don't really know how well anyone handles their team.
Well I've faced Painter's Ice team, it's pretty good.
Shineyninetails is usually a good battler, but monotype teams change things.
Those are the only Battle Frontier leaders I really know.
You seem good enough to be able to beat them though. It's up to you.
Check out the other leagues as well.
Oh yeah. Put this in your signature.