Originally Posted by Fat Drifblim
I myself would not recommend Shard on a Scarf set, you probably have an attack lowering nature so it just won't be hitting hard, and not that much outspeeds Scarf Abomasnow. HP Fire could be good for coverage against Meta and Scizor, but remember they will KO right back if they hadn't already been weakened. Last move could be Sheer Cold for a final last resort, the only other worthwhile move at that point might be Wood Hammer for low Defense Waters.
I second this. Blizzard, Giga Drain, HP Fire.
If you plan on using a physical attack for your last move, use a Hasty nature, so that you don't get an Attack drop. Then Ice Shard and Wood Hammer become viable options (though Ice Shard + Choice Scarf is slightly redundant).
You could also consider Grass Knot, as a few Pokemon are hit harder by it than Giga Drain (Against Tyranitar, Terrakion, Gigalith, Rhyperior, and Mamoswine specifically, Grass Knot is Abomasnow's strongest attack, even over Blizzard), but then you wouldn't be healed by Giga Drain either.