Emerald Battle Frontier Help!

[Random Passerby]

Alright, now that I've beaten the Elite Four on my game, I'm trying to make a good Battle Frontier team, but every one I make loses at some point or another...Help anyone??

I've got a few Lv. 50 Pokemon, they are:

Shiny Crobat--White Herb
Poison Fang/Bite/Mean Look*/Confuse Ray

Salamence--Leftovers
Fly/Flamethrower/Dragon Claw/Headbutt

Aggron--Quick Claw
Iron Tail/Earthquake/Ice Beam/Thunder

Banette--Spell Tag
Psychic/Shadow Ball/Will'o'Wisp*/Toxic

*-Indicates a move I think I should change.

Thanks in advance for any help!!