Sandstorm team

[Stubby Boardman]

This team are at level 100 and are going to be used in a 2 on 2 battle. If you think anything is poor about this team please tell me changes I can make to it don't just point it out tell whatit make it better. Also since this is a sandstorm team I am aware that most if not all are weak aginst water and ice so if you have any suggestion how to get rid of some of these weakness please tell me.

Name:Tyranitar
Nature:???Please help me with this
Ability:Sand Stream
Item:
Atk1:Dragon Dance/Protect
Atk2:Earhtquake
Atk3:Dig/Aerial Ace
Atk4:Iron Tail/Rock Slide

Name:Steelix
Nature:Adament/Careful
Ability:Sturdy
Item:
Atk1:Sandstorm
Atk2:Iron Tail
Atk3:Rock Slide/Earthquake
Atk4:Dig/Protect

Name:Sandslash
Nature:Adament/Careful
Ability:Sand Veil
Item:
Atk1:Iron Tail
Atk2:Earthquake
Atk3:Aerial Ace
Atk4:Protect/Double Team/Sandstorm

Name:Flygon
Nature:???help me
Ability:Levitate
Item:
Atk1:Sandstorm
Atk2:Fly
Atk3:Eathquake
Atk4:Iron Tail/Wing Attack

Name:Cacturne
Nature:Modest
Ability:Sand Veil
Item:
Atk1:Ingrain
Atk2:Leech Seed
Atk3:Needle Arm
Atk4:Giga Drain/Protect

Name:Magneton
Nature:Modest/Calm/Bold/Timid
Ability:Magnet Pull
Item:
Atk1:Toxic
Atk2:Shock Wave/Thunder Bolt
Atk3:Protect
Atk4:???help me with last attack

I'm not sure if sandstorm effects steel pokemon. If sandstorm hurts steel type please tell me what other pokemon I should use.