Well, Stealth Rock slightly, only ever so slightly disrupts your team. Which is rather unfortunate for Ice monotypes, but either way I suggest a Cloyster or Cryogonal(I THINK it can learn Rapid Spin?) because well, let's face it, it's an incredibly common move annd 5/6th of your pokemon are weak to it. Also, as SevenDeadlySins pointed out, Scizor is a huge threat to your team, and I'd imagine bulky fighting types, like say, Conkeldurr also be quite troublesome.