Steelix = Yes w/, Earthquake/Rock Slide/Explosion/Roar IMOGo for Steelix, because you don't have any kind of tank on your team, and Scizor isn't that good anyway.
Steelix @ Leftovers
- Rock Slide/Double-Edge
Since this is probably ingame, you can lose Roar and put one of the other options in the last slot. I would say Double Edge with Rock Head, but it's your choice.