Lucario OHKOs Gliscor with HP Ice, Scizor U-Turns out of anything and thus isn't countered, Heatran, as you pointed yourself, can Explode or just SubTorment.
ScarfCress was the argument used by.. uh, Setrack I think it was, to debunk the 100% counter argument and/or to troll on the GameFAQs...