I'm not sure you realize that Kyurem-B can setup on Ferrothorn as well.
Kyurem-B could just run Sub/Roost/Hone Claws/Outrage, use Ferrothorn as setup bait while wasting its Gyro Ball PP and lay waste on the rest of the opponent's team thanks to its higher speed and attack compared to Zekrom.
The only loss here is STAB Bolt Strike, but does it really matter when you have STAB Outrage coming form 170 attack and you outspeed all the base 90's?
Yes?
So stop assuming that Ferrothorn is a 100% counter to Kyurem-B or that Kyurem-B can't effectively run a SubClaws set because it's not the case.
We are not assuming
Or you could just run a simple CB set and 1HKO/2HKO everything or a mixed set to crush pretty much every wall in the tier, including Chansey and Blissey (which Kyurem-W has trouble against).
I fail to see how it does this better than Zekrom. You know what the funny thing is? Lugia is a check to Kyurem-B! Thunder wave, Roost, wait for parahax and then whirlwind it out. To clarify:
252Atk Life Orb Teravolt Kyurem Black (Neutral) Fusion Bolt vs 252HP/176Def Leftovers Lugia (+Def): 52% - 62% (220 - 260 HP). Guaranteed 2HKO.
148Atk Life Orb Teravolt Zekrom (+Atk) Bolt Strike vs 252HP/176Def Leftovers Lugia (+Def): 95% - 112% (396 - 470 HP). Guaranteed 2HKO. 72% chance to OHKO.
Now you ask, why didnt I include Choice Band in the calculation? Well because people wouldnt be stupid enough to check Kyurem-B with Lugia when its locked into Fusion Bolt
And SubClaws Zekrom is still not getting past Groudon period, unless the Groudon user is stupid enough to let it Sub first. Groudon, the third most common pokemon in ubers. I'm not sure you realize how bad this is.
Zekrom has its advantages over Kyurem-Bm but to say it outclasses it is plain asinine.
This made me lol so hard. How can you stall Gyro ball when you can only make 5 subs?
48Atk
Ferrothorn (Neutral)
Gyro Ball vs 4HP/0Def
Kyurem Black (Neutral): 82% - 97% (324 - 384 HP). Guaranteed 2HKO.
Good luck. This gets even worse after stealth rock damage as then you will only make 3 substitutes and die to Gyro Ball even if you roost.
You realize that as you are
magically stalling Gyro Ball, you will only set up after Ferrothorn switches out? OKaaay, so it switched out to Palkia as you set up one hone claws. You click Outrage and......Ferrothorn is back in to cause some iron barb damge. That set can easily be phazed out by Skarmory. BTW, did you know that Zekrom can run Dragon Claw instead because it already has another STAB?
SubClaws Zekrom cant get past Groudon? Set up hone Claws on the switch as Groudon comes in, Outrage for the 2HKO on Support Groudon - Groudon cant OHKO back.
252Atk +1 Teravolt
Zekrom (+Atk)
Outrage vs 252HP/252Def Leftovers
Groudon (+Def): 50% - 59% (204 - 241 HP). Guaranteed 2HKO.
252Atk Life Orb +1 Teravolt
Zekrom (+Atk)
Outrage vs 112HP/0Def
Groudon (Neutral): 94% - 111% (348 - 411 HP). Guaranteed 2HKO. 66% chance to OHKO. OHKO after stealth rock.
I dont even see why Zekrom couldnt do the same with your Kyurem-B set. In practice, Zekrom kills one opposing Dragon before being forced out - how is Kyurem-B supposed to do better than that with just outrage? Zekrom can easily get past Skarmory and Lugia.
48Atk
Ferrothorn (Neutral)
Power Whip vs 4HP/0Def
Kyurem Black (Neutral): 16% - 19% (64 - 76 HP). Guaranteed 7HKO.
48Atk
Ferrothorn (Neutral)
Power Whip vs 4HP/0Def
Zekrom (Neutral): 16% - 19% (55 - 66 HP). Guaranteed 7HKO.
Earlier in this thread, you said Kyurem-B is bulkier which isnt true when you factor in Stealth Rock damage.
Groudon doesnt counter Zekrom as hard as you think it does. It can only take on the choice scarf set. The other set(Choice Band, Mixed, Hone Claws) can beat Groudon. Zekrom's only real counter is Ground Arceus. Did I forget to mention that Kyurem-B is beaten by Jirachi?