I would go with the other raters and use Thunderbolt / Thunder over Ice Beam on Starmie. I would consider Rock Polish over Earthquake on Terrakion since, with Focus Sash, its a great means of getting that additional boost. Earthquake is hitting what exactly anyway that Garchomp and Mamoswine aren't? Any particular reason for Iceicle Crash over Icicle Spear by the way? Seems like it would helpe vs. Dragonite, LandyT, and SubGliscor more.
Pretty solid team so no more comments here. GL! (Deleting other Post so yeah).