Originally Posted by Fat hichez
No Kyurem-W can't OHKO everything. Also you have to get the safe switch-in. I don't think there is an efficient defense set for Kyurem-W. Plus you always know 3 moves of most Kyurem-W sets. Draco meteor/inferior dragon move, ice beam, and fusion flare. Pokemon like blissey still tank this beast.
IIRC, Blissey takes 41~48% from a Specs Draco Meteor, so if Blissey comes in 3 layers of Spikes and Rocks on the field (which is pretty easy to set up in ubers), she could be KOed by the second Draco Meteor.