Honestly, I can only find a couple nitpicks here:
Politoed:
You may want to try Surf over Perish Song. I run a ScarfToed, and I've got to admit, it's a mjor badass. However, revenging Excadrill with Hydro Pump is a bit touch and go; I like Surf for its easy, reliable power, and use Hydro Pump to decimate something when I really need the extra power.
Dugtrio: Why the HELL are you running Focus Sash and Substitute on the same set? Its defenses aren't taking any hits regardless, so run something like Sucker Punch or Shadow Claw over Substitute.
Starmie: Surf+LO>Hydo Pump+Lefties. Still OHKOs Scizor, and give Ice Beam and Hidden Power [Grass] that extra "oomph".
That's all I can do, hope I helped!