Looks like Magneton is going to be the new MegaCham here pretty shortly.
The recent Kyurem-B talk has my attention, however. As much as I feel bad for Kyurem being considered one of the worst Legendaries (I have seen people that treat this with less respect than Regigigas--no lie), I have to saw that the meta change hasn't been the best for it. The recent trend seems to be towards Bulky Sand and Steel-Types, the latter especially giving Kyurem-B problems, as well as its original problems like Stealth Rock being absolutely prevalent.
Just from the above examples, Kyurem-B seems to maintain a severe lack of counters, which was always boasted before this Gen. However, Mega Slowbro and Mega Scizor has risen and have been proven to be top checks for it. On another note, Kyurem-B's over reliance on Life Orb with its most popular set hinders its lastability, even with Roost, thanks to Sandstorm being ever so popular. Finally, as mentioned above, Kyurem-B is very weak to Revenge Killing, even more so than MegaCham (no, I'm not saying which is better, but I wanted to draw a similarity between relevant wallbreakers). Many Pokemon will easily outspeed and KO Kyurem-B on the spot, particularly popular Pokemon like Landorus-T, Excadrill, Latios, Mega Scizor, Mega Diancie, Keldeo, Choice Scarf Tyranitar, Ferrothorn (on the OHKO part), Manaphy, and Weavile just to name some popular choices for teams. Kyurem-B's claim to fame is that it makes the next turn a prediction that will lead one side to victory. It makes the opponent guess which set it is and which move it will use. "Do I switch in Clefable hoping it's the Life Orb set?" "Do I predict Earth Power and switch into Landorus-T?" "Will it outspeed Tornadus-T with Choice Scarf?" These are scenarios that we are all familiar with, but we never, without a doubt, forgot about the titan of power that is Kyurem-B.
There is, however, a huge problem; though Kyurem-B can prevent switch ins very easily, somewhat ironically, it has difficulty switching in. Firstly, the Stealth Rock weakness is irritating, taking down some of its capabilities by 25% of its HP. Secondly, despite its bulk, its typing leaves it open to multiple attacks like Stone Edge, Iron Head/Bullet Punch, Draco Meteor/Outrage, Focus Blast/Close Combat, and Play Rough/Moonblast, all of which are somewhere in the metagame and there hardcore thanks to Landorus-T, Excadrill, Scizor, Latios, Garchomp, Clefable, Azumarill, and anything that likes Fight-Coverage like Alakazam (because Focus Miss is one of the biggest coverage moves since Hidden Power, apparently). Most of the Pokemon I just listed are extremely prevalent in this meta, which hinders its job more than ever. Finally, as mentioned before, the ease of Revenge Killing might be the biggest killer for it. Won't repeat that one.
Though Kyurem-B is a fantastic wallbreaker that even puts Stall under pressure like no other, it cannot go without saying that Kyurem-B's flaws are very huge and the meta hasn't been very kind to it. I'm going to oppose the rise for now.
The recent Kyurem-B talk has my attention, however. As much as I feel bad for Kyurem being considered one of the worst Legendaries (I have seen people that treat this with less respect than Regigigas--no lie), I have to saw that the meta change hasn't been the best for it. The recent trend seems to be towards Bulky Sand and Steel-Types, the latter especially giving Kyurem-B problems, as well as its original problems like Stealth Rock being absolutely prevalent.
Offensive Landorus-T has this to back its power up and has the Speed to outspeed any variant of Kyurem-B bar Choice Scarf.
252 Atk Landorus-T Stone Edge vs. 0 HP / 0- Def Kyurem-B: 264-312 (67.5 - 79.7%) -- 37.5% chance to OHKO after Stealth Rock
Offensive Garchomp outspeeds Kyurem-B and has this to throw in:
252 Atk Garchomp Dragon Claw vs. 0 HP / 0- Def Kyurem-B: 290-344 (74.1 - 87.9%) -- 93.8% chance to OHKO after Stealth Rock
Outside a Sandstorm, Kyurem-B will outspeed and OHKO Excadrill. In one, however, Excadrill will outspeed and OHKO Kyurem-B.
Heatran is out of the question since most Kyurem-B enjoy carrying Earth Power.
Azumarill cannot switch in or stay in since almost every variant of Kyurem-B runs Fusion Bolt, a guaranteed OHKO with Stealth Rock.
Short of the Choice Band set, Clefable is mostly a safe answer, being able to heal off Ice Beam relative easily and 2HKOing with Moonblast.
Mega Scizor, a Pokemon rampant like its original counterpart in Gen 4 and 5, is just as much trouble for Kyurem-B, if not more so thanks to its increased bulk. Some variants run Hidden Power Fire, but those are pretty rare and mostly confined into the Choice Specs set.
Latios is a fantastic revenge killer, OHKOing easily with Draco Meteor, though it must watch out for Ice Beam and any Dragon-Type move.
Mega Diancie can easily outspeed and KO any Non-Choice Scarf variant, but has almost no way to safely switch in; Earth Power is a clean OHKO and Ice Beam?
252+ SpA Life Orb Teravolt Kyurem-B Ice Beam vs. 0 HP / 0- SpD Mega Diancie: 204-242 (84.6 - 100.4%) -- 81.3% chance to OHKO after Stealth Rock
Keldeo is absolutely destroyed by Fusion Bolt but can OHKO with Secret Sword after Stealth Rock.
The once safe Rotom-W with its high and mighty Levitate is removed from its throne thanks to Teravolt.
252+ SpA Life Orb Teravolt Kyurem-B Earth Power vs. 248 HP / 0 SpD Rotom-W: 250-296 (82.5 - 97.6%) -- 62.5% chance to OHKO after Stealth Rock
Tornadus-T will outspeed and 2HKO easily, but Kyurem-B can do the same back with Ice Beam (after Stealth Rock) and Fusion Bolt.
Choice Scarf Tyranitar outspeeds and OHKOs with Stone Edge after Stealth Rock, though it loses more than half from Earth Power.
Ferrothorn can OHKO Kyurem-B after Stealth Rock, barely avoiding the 2HKO from Ice Beam.
Manaphy may outspeed it, but...
4 Atk Life Orb Teravolt Kyurem-B Fusion Bolt vs. 0 HP / 4 Def Manaphy: 296-351 (86.8 - 102.9%) -- 93.8% chance to OHKO after Stealth Rock
Don't switch in.
Calm Mind Slowbro is a decent answer, even avoiding the 2HKO from Earth Power and Fusion Bolt thanks to Slack Off.
Base Slowbro, on the other hand, is decimated and 2HKOd.
Talonflame would never want to switch in on Kyurem-B--hell, Acrobatics only does 40.9% minimum, but it IS a 2HKO after Stealth Rock.
Weavile's Low Kick can OHKO after Stealth Rock, but so can Kyurem-B's Fusion Bolt.
Even Mega Sableye falls in two Ice Beams after Stealth Rock.
Amoonguss and Quagsire dare not try to switch in; Amoonguss's weakness to Ice Beam hinders it, and Quagsire is 2HKOd by Ice Beam regardless.
252 Atk Landorus-T Stone Edge vs. 0 HP / 0- Def Kyurem-B: 264-312 (67.5 - 79.7%) -- 37.5% chance to OHKO after Stealth Rock
Offensive Garchomp outspeeds Kyurem-B and has this to throw in:
252 Atk Garchomp Dragon Claw vs. 0 HP / 0- Def Kyurem-B: 290-344 (74.1 - 87.9%) -- 93.8% chance to OHKO after Stealth Rock
Outside a Sandstorm, Kyurem-B will outspeed and OHKO Excadrill. In one, however, Excadrill will outspeed and OHKO Kyurem-B.
Heatran is out of the question since most Kyurem-B enjoy carrying Earth Power.
Azumarill cannot switch in or stay in since almost every variant of Kyurem-B runs Fusion Bolt, a guaranteed OHKO with Stealth Rock.
Short of the Choice Band set, Clefable is mostly a safe answer, being able to heal off Ice Beam relative easily and 2HKOing with Moonblast.
Mega Scizor, a Pokemon rampant like its original counterpart in Gen 4 and 5, is just as much trouble for Kyurem-B, if not more so thanks to its increased bulk. Some variants run Hidden Power Fire, but those are pretty rare and mostly confined into the Choice Specs set.
Latios is a fantastic revenge killer, OHKOing easily with Draco Meteor, though it must watch out for Ice Beam and any Dragon-Type move.
Mega Diancie can easily outspeed and KO any Non-Choice Scarf variant, but has almost no way to safely switch in; Earth Power is a clean OHKO and Ice Beam?
252+ SpA Life Orb Teravolt Kyurem-B Ice Beam vs. 0 HP / 0- SpD Mega Diancie: 204-242 (84.6 - 100.4%) -- 81.3% chance to OHKO after Stealth Rock
Keldeo is absolutely destroyed by Fusion Bolt but can OHKO with Secret Sword after Stealth Rock.
The once safe Rotom-W with its high and mighty Levitate is removed from its throne thanks to Teravolt.
252+ SpA Life Orb Teravolt Kyurem-B Earth Power vs. 248 HP / 0 SpD Rotom-W: 250-296 (82.5 - 97.6%) -- 62.5% chance to OHKO after Stealth Rock
Tornadus-T will outspeed and 2HKO easily, but Kyurem-B can do the same back with Ice Beam (after Stealth Rock) and Fusion Bolt.
Choice Scarf Tyranitar outspeeds and OHKOs with Stone Edge after Stealth Rock, though it loses more than half from Earth Power.
Ferrothorn can OHKO Kyurem-B after Stealth Rock, barely avoiding the 2HKO from Ice Beam.
Manaphy may outspeed it, but...
4 Atk Life Orb Teravolt Kyurem-B Fusion Bolt vs. 0 HP / 4 Def Manaphy: 296-351 (86.8 - 102.9%) -- 93.8% chance to OHKO after Stealth Rock
Don't switch in.
Calm Mind Slowbro is a decent answer, even avoiding the 2HKO from Earth Power and Fusion Bolt thanks to Slack Off.
Base Slowbro, on the other hand, is decimated and 2HKOd.
Talonflame would never want to switch in on Kyurem-B--hell, Acrobatics only does 40.9% minimum, but it IS a 2HKO after Stealth Rock.
Weavile's Low Kick can OHKO after Stealth Rock, but so can Kyurem-B's Fusion Bolt.
Even Mega Sableye falls in two Ice Beams after Stealth Rock.
Amoonguss and Quagsire dare not try to switch in; Amoonguss's weakness to Ice Beam hinders it, and Quagsire is 2HKOd by Ice Beam regardless.
Just from the above examples, Kyurem-B seems to maintain a severe lack of counters, which was always boasted before this Gen. However, Mega Slowbro and Mega Scizor has risen and have been proven to be top checks for it. On another note, Kyurem-B's over reliance on Life Orb with its most popular set hinders its lastability, even with Roost, thanks to Sandstorm being ever so popular. Finally, as mentioned above, Kyurem-B is very weak to Revenge Killing, even more so than MegaCham (no, I'm not saying which is better, but I wanted to draw a similarity between relevant wallbreakers). Many Pokemon will easily outspeed and KO Kyurem-B on the spot, particularly popular Pokemon like Landorus-T, Excadrill, Latios, Mega Scizor, Mega Diancie, Keldeo, Choice Scarf Tyranitar, Ferrothorn (on the OHKO part), Manaphy, and Weavile just to name some popular choices for teams. Kyurem-B's claim to fame is that it makes the next turn a prediction that will lead one side to victory. It makes the opponent guess which set it is and which move it will use. "Do I switch in Clefable hoping it's the Life Orb set?" "Do I predict Earth Power and switch into Landorus-T?" "Will it outspeed Tornadus-T with Choice Scarf?" These are scenarios that we are all familiar with, but we never, without a doubt, forgot about the titan of power that is Kyurem-B.
There is, however, a huge problem; though Kyurem-B can prevent switch ins very easily, somewhat ironically, it has difficulty switching in. Firstly, the Stealth Rock weakness is irritating, taking down some of its capabilities by 25% of its HP. Secondly, despite its bulk, its typing leaves it open to multiple attacks like Stone Edge, Iron Head/Bullet Punch, Draco Meteor/Outrage, Focus Blast/Close Combat, and Play Rough/Moonblast, all of which are somewhere in the metagame and there hardcore thanks to Landorus-T, Excadrill, Scizor, Latios, Garchomp, Clefable, Azumarill, and anything that likes Fight-Coverage like Alakazam (because Focus Miss is one of the biggest coverage moves since Hidden Power, apparently). Most of the Pokemon I just listed are extremely prevalent in this meta, which hinders its job more than ever. Finally, as mentioned before, the ease of Revenge Killing might be the biggest killer for it. Won't repeat that one.
Though Kyurem-B is a fantastic wallbreaker that even puts Stall under pressure like no other, it cannot go without saying that Kyurem-B's flaws are very huge and the meta hasn't been very kind to it. I'm going to oppose the rise for now.