I've tested two different sets with Kyurem-Black, who has a great movepool and access to interesting moves. However, its double type is a real weakness in 1v1 tier in which there is too many steel and fight / fairy types in high viability ranking.
Special Offense Kyurem-Black
Kyurem-Black @ Choice Specs
Ability: Teravolt
EVs: 4 HP / 252 SpA / 252 Speed
Timid Nature
- Draco Meteor
- Ice Beam
- Earth Power
- Flash Cannon
Moves
Draco Meteor is the best Special hyper offense STAB move for Kyurem-Black. It allows Kyurem to lose 80% of Wobbuffet HPs and OHKO many high viability ranking Pokemons such as Charizard X-Y, Porygon Z, Kyurem-Black non scarf, Mega Salamence, Dragonite, Victini and Mega Gyarados. This is the most powerful move of Kyurem-Black as Special Dragon type, combinated with Specs, it is essential to make a lot of damages.
Ice Beam is the second best Special STAB move on Kyurem. It allows it to counter many Flying / Grass type Pokemons such as Togekiss / Mega Venusaur / Whimsicott and Ferrothorn. Mega Venusaur and Ferrothorn are 2HKOed by Specs Ice Beam, losing 60% and 70% per attacks. It also allows Kyurem to counter Dragon type such as Dragonite, which isn't faster than Kyurem and even with Multiscale it would get OHKOed.
Earth Power is a coverage move that is essential to Kyurem. It allows Kyurem to counter Steel type Pokemons who are really present in the 1v1 tier such as Mega Metagross, Mega Mawile, Mega Aggron and Jirachi. However Mega Metagross, Jirachi and Mega Aggron aren't OHKOed by Kyurem-Black Earth Power. It also allows Kyurem to totally counter Heatran without Air Ballon, who would be OHKOed because of its double weakness to ground type.
Flash Cannon is the last powerful Special move of Kyurem. It allows Kyurem to counter Fairy type Pokemons such as Mega Gardevoir, Mega Altaria, Clefable and Sylveon. However, Sylveon wouldn't be OHKOed by Kyurem Specs Flash Cannon.
Set Details
The EV's repartition is made to be a Special hyper offense. 252 in SpA and Speed allows Kyurem to OHKO many Pokemons, it can easily beat Greninja and some high viability ranking Pokemons in the 1v1 tier.
Timid Nature is to maximizing its Speed stat, it could allow Kyurem to be faster than other Kyurems without Scarf, and then to not be OHKOed by Outrage. It can also outspeed Dragonite.
Teravolt combinated with Specs is great to counter Sturdy strategy Pokemons such as Golem or Magnezone. Indeed, Teravolt is like Mold Breaker, it ignores the opponent ability, which means that Sturdy isn't working against Kyurem Black. It allows Kyurem to OHKO Golem, Magnezone and Probopass.
Other Options
Kyurem-Black can be played with a Choice Scarf instead of a Specs Choice but its power will be substantially decreased. It would probably not OHKO some Mega such as Charizard Y, who has access to Roost for example and Mawile Mega aswell with Earth Power but it could outspeed a lot of Pokemons. Mega Salamence would be OHKOed by Kyurem Ice Beam if it is scarfed.
Expert Belt is also a good option to this set but Draco Meteor will not be boosted if Kyurem hits the opponent as neutral attack.
Check and Counters
- Stallers: Bulky Stallers such as Chansey Eviolite and Deoxys-Defense are totally countering Special offens Kyurem. It wouldn't do anything against these Pokemons and would lose against Seismic Toss. Sylveon who isn't played stall could still counter Kyurem Black because of its huge SpD stat and Hyper Voice Pixilated.
- Faster Pokemons: Mega Lopunny is countering Special Kyurem aswell, who would be OHKOed by High Jump Kick. Some Scarf Pokemons such as Jirachi, Togekiss and Porygon Z could also counter Kyurem. Mega Salamence is also countering Kyurem with Outrage and higher Speed stat. Terrakion Close Combat is really fast aswell, Kyurem couldn't handle its powerful STAB attack.
- Steel Type Pokemons: They are the bigger problem of Kyurem actually. It can't OHKO Mega Metagross, who is faster and could easily beat Kyurem with Meteor Smash. Mega Aggron is really bulky + its Filter Ability that allows it to not be OHKOed by Kyurem Earth Power and Heavy Slam is powerful on Aggron M. Jirachi Scarf Iron Head counters Kyurem aswell, with Serene Grace Kyurem is sure to lose the game.
In conclusion of this set, it isn't greater than the physical hyper offense one, it still has many weaknesses and it's actually not strong enough to be played with a Scarf, which allows Kyurem to be faster instead of its physical set. It needs a Specs to be decent, at the expense of its Speed stat. However, Specs Kyurem is a great counter to Mega Mawile, who is really present on the 1v1 tier, instead of its physical set with Earth Power that always 2HKO Mawile. This set can also surprise Wobbuffet and some defensive pokemons such as Mega Mawile and Charizard X will try to use counter against Kyurem Black, which allows it to 2HKO them.
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Bulky Staller Kyurem-Black
Kyurem-Black @ Haban Berry
Ability: Teravolt
EVs: 252 HP / 252 Def / 4 SpA
Bold Nature
- Substitute
- Toxic
- Roost
- Earth Power
Moves
Substitute is a nice move in this set. It allows Kyurem to be protected from Toxic Stall users such as Deoxys Defense and Chansey. Beside, Substitute allows Kyurem to counter Draco Meteor Users such as Latias, Altaria and Kyurem aswell because the Substitute will absorb the attack and the opponent will lose x2 in SpA which is really great in 1v1 if that's a Special Pokemon.
Toxic is essential to Kyurem stall strategy. It is the move that will make the most pressure to the opponent. It also allows Kyurem to counter staller such as Chansey and Deoxys Defense.
Kyurem Black has access to Roost which gives it 50% of its HP. It's a great move in a stall build like this one, it allows Kyurem to recover HP after using Substitute and keeping the Toxic pressure.
Earth Power is the coverage offensive attack to Kyurem. Indeed the only one huge problem to this build is Steel type, Earth Power can affect them, could be very dangerous on Heatran but it is not a move that is used to be offensive actually, it's just to increase the damages of Toxic.
Set Details
Maximize Defense stat with Bold Nature and 252 in Defense. It will allows Kyurem to be 2HKOed by physical offensive dragon attacks such as Outrage Kyurem / Dragonite and Salamence. Beside, playing with Hablan Berry allows Kyurem to only be hitted by 30% to the next Dragon attack. Charizard Y with Dragon Pulse will not do more that 20% damages.
To increase the chances to stay alive against Physical hyper offense, maximizing HP stat is a great choice because most of the Pokemons in 1v1 tier are played physically offensive.
Teravolt isn't that useful with that set, Kyurem could touch Levitate Pokemons such as Gengar or Latias/Tios with Earth Power and it could also use Toxic on Snorlax with the Immunity ability.
Other Options
Protect could be another option in this set instead of Substitute. It would allow Kyurem to have more resistance against Outrage Pokemon users such as Dragonite Band, Kyurem and Salamence.
Check and Counters
- Prankster: They totally counter this stall build. Indeed they can use Taunt and Encore, which can bypass Substitute and this build will be totally useless. Whimsicott and Sableye can counter Kyurem.
- Offensive Steel / Fairy type: Mega Mawile totally counters this set. Indeed, its double type allows Mawile to not be affected by Toxic, and Earth Power wouldn't be effective on this defensive set. Beside, Hablan Berry works only on Dragon Type attacks, which means that Fairy and Steel Type attacks can be dangerous for Kyurem. Mega Metagross and other Steel types in the 1v1 tier are a problem to this set. Skamory totally counters Kyurem because it has an immunity to toxic and it can't be affected by Earth power due to its Flying type.
- Offensive Special: This build isn't really effective against Special offensive Pokemons such as Mega Gardevoir and Sylveon that can both bypass Substitute with Hyper Voice Pixilated.
In conclusion of this set, Kyurem has access to Roost, which can be interesting to use in a stall build. However, its double type makes it really weak against a lot of Types that are common in the actual 1v1 tier and in the high viability ranking Pokemons sets. It can't really handle Fairies Special Pokemons and Taunt totally breaks its strategy.