I'd love to see someone like steven using a team like this!:
Tyranitar- Perfect setup and automatic sandstorm! Perhaps a Rocky helmet for hold.
Garchomp- Sand veil+Lax incense = Troll. Swords dance will have you crying aswell.
Metagross- Tank with a priority move for extra difficulty. Leftovers would work for it.
Excadrill (sand rush)- Sweep! Let it hold something like an expert belt.
Shadow claw/Brick break
Caracoasta(sturdy)- Shell smash+Sturdy= Win sweep. I'd let it hold a lum berry maybe.
Archeops- Could probably hold a sitrus berry incase it goes just below half HP.
I'm not sure about a moveset because I've never used it!, but Iris' looks tough so hers probably has good moves.