So, because I was bored and couldn't get to sleep, I went on damagecalc and ran Adaptability Kyurem against every bulky pokemon in OU. I guess some of these their secondary or primary typings but in some cases that actually becomes worse.
This is assuming a moveset of Substitute/Roost, Hone Claws, Outrage, and Iron Head, alone.
252+ Atk Kyurem-B Iron Head vs. 252 HP / 252+ Def Altaria: 180-214 (50.8 - 60.4%) -- guaranteed 2HKO
+1 252+ Atk Kyurem-B Iron Head vs. 252 HP / 252+ Def Altaria: 272-320 (76.8 - 90.3%) -- guaranteed 2HKO
+1 252+ Atk Kyurem-B Iron Head vs. 240 HP / 0 Def Azumarill: 211-249 (52.6 - 62%) -- guaranteed 2HKO
252+ Atk Huge Power Azumarill Play Rough vs. 56 HP / 0 Def Kyurem-B: 356-422 (87.9 - 104.1%) -- 25% chance to OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 4 HP / 252+ Def Eviolite Chansey: 698-822 (108.7 - 128%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 156+ Def Celebi: 412-486 (101.9 - 120.2%) -- guaranteed OHKO (common celebi set. 85.4% chance to OHKO if 252 Def EVs)
+1 252+ Atk Kyurem-B Iron Head vs. 252 HP / 160 Def Clefable: 374-440 (94.9 - 111.6%) -- 68.8% chance to OHKO
252+ Atk Kyurem-B Iron Head vs. 252 HP / 252+ Def Unaware Clefable: 206-244 (52.2 - 61.9%) -- 98.4% chance to 2HKO after Leftovers recovery
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Conkeldurr: 392-462 (94.6 - 111.5%) -- 68.8% chance to OHKO (If anyone were to ever run that at all)
+1 252+ Atk Kyurem-B Iron Head vs. 252 HP / 252+ Def Diancie: 380-448 (125 - 147.3%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 88+ Def Ferrothorn: 177-209 (50.2 - 59.3%) -- 79.3% chance to 2HKO after Leftovers recovery
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Garchomp: 784-924 (186.6 - 220%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 56+ Def Gliscor: 376-444 (106.2 - 125.4%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 248 HP / 0 Def Heatran: 250-295 (64.9 - 76.6%) -- guaranteed 2HKO after Leftovers recovery
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 248 HP / 252+ Def Heatran: 182-215 (47.2 - 55.8%) -- 21.5% chance to 2HKO after Leftovers recovery
(Remember, it's neutral to flash cannon and resists fire now)
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Hippowdon: 340-400 (80.9 - 95.2%) -- guaranteed 2HKO after Leftovers recovery
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Jirachi: 190-224 (47 - 55.4%) -- 17.6% chance to 2HKO after Leftovers recovery
252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 240+ Def Landorus-T: 274-324 (71.7 - 84.8%) -- guaranteed 2HKO after Leftovers recovery (assuming Cube's not beind a sub, so it gets the intimidate in)
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 240+ Def Landorus-T: 410-484 (107.3 - 126.7%) -- guaranteed OHKO (cube behind sub, so ignores attack drop)
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Mega Metagross: 142-168 (39 - 46.1%) -- guaranteed 3HKO (Chances of seeing anyone use this?)
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 4 HP / 0 Def Mega Metagross: 185-218 (61.2 - 72.1%) -- guaranteed 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Mega Latias: 668-788 (183.5 - 216.4%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 172 HP / 0 Def Magnezone: 233-275 (71.9 - 84.8%) -- guaranteed 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 104+ Def Mew: 432-510 (106.9 - 126.2%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 248 HP / 216+ Def Rotom-W: 374-440 (123.4 - 145.2%) -- guaranteed OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 248 HP / 0+ Def Mega Scizor: 180-212 (52.4 - 61.8%) -- guaranteed 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Skarmory: 150-177 (44.9 - 52.9%) -- 28.9% chance to 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Mega Slowbro: 248-292 (62.9 - 74.1%) -- guaranteed 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 232+ Def Slowbro: 362-426 (91.8 - 108.1%) -- 50% chance to OHKO
+1 252+ Atk Kyurem-B Iron Head vs. 252 HP / 220+ Def Sylveon: 340-402 (86.2 - 102%) -- 12.5% chance to OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 248 HP / 252+ Def Tyranitar: 356-420 (88.3 - 104.2%) -- 25% chance to OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 252+ Def Mega Tyranitar: 284-336 (70.2 - 83.1%) -- guaranteed 2HKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 240+ Def Mega Venusaur: 330-390 (90.6 - 107.1%) -- 43.8% chance to OHKO
+1 252+ Atk Adaptability Kyurem-B Outrage vs. 252 HP / 168+ Def Zapdos: 456-538 (118.7 - 140.1%) -- guaranteed OHKO
Although the calculations do show Kyurem-B to be overwhelming strong, coupled with an adaptability boost, great typing with an Ice resist and decent bulk, I am reluctant to ban it outright. I do agree that it should be suspected as a priority, but as xJownage has shown in his post, their a plenty of other offensive threats to worry about as well. It has only been a day since the metagame was posted, and seeing as the metagame can't be played, we can't only see how strong it looks on paper in 1v1 situations, not in a dynamic battle. I would like to see more arguments that Kyurem-B can't be checked, or at least revenge killed, by anything relevant before I would quick ban it.. imo, we shouldn't quickban it, as much as its broken on paper, i mean, this is going to be clearly an offensive meta, and maybe some checks will arise...but idk. it should be suspect #1 clearly.
What mega-evolutions do people see will become most valuable in this metagame?