White Kyurem is mindless "click Draco Meteor or one of your other attacks, watch things die", but Black Kyurem isn't bad at all. I just tried a Sub/Roost/Fusion Bolt/Dragon Claw @Leftovers set. To give you an idea of how destructive it is, it OHKO'd Ho-oh at full health. Did I mention that BK was holding Lefties? It's so easy to set up against a plethora of walls (Blissey and Lugia in particular) and it single-handedly defeats all of them with the appropriate attack. You can replace Dragon Claw with Ice Beam if you're afraid of physical walls. Specially defensive Ferrothorn gives it trouble, but thanks to Sub and Roost BK will come on top. White Kyurem will probably force many pokemon like Kyogre to run specially defensive sets and that's where Black Kyurem comes in. Kyogre is hoping to "wall" White with a Sp.Def spread? Meet Black Kyurem's Fusion Bolt. And unlike Zekrom, BK can actually switch on Kyogre. Considering that a single Freeze Shock has 10 BP less than 2 Ice Punches, I don't think it's completely unusable. Kyurem's physical movepool is pretty limited anyway so you might as well slap FS on a Choice Band set and it might be useful once in a blue moon. If my calculations are right CB Freeze Shock is so strong that it OHKO's the standard uber Ferrothorn 100% (90% factoring accuracy) of the time even without entry hazards. It could also be useful to OHKO Wobbuffet without giving it the chance to use Counter (Outrage can never OHKO 252/252 with a +Def nature, Freeze Shock will with SR on the field). Even if they switch out, unless Heatran or Cloyster are sent in (the only viable pokemon in ubers with a 4x ice resist), everything is going to take huge damage with a chance of paralysis on top of it.