Kyurem-B is actually in XY UU on PO :P I'm expecting it to be banned soon though as people are already complaining. As far as OU goes, all three sets in the OP are garbage (just saying it as it is). Here is what they should look like:
Substitute Attacker:
Kyurem (Kyurem-B) @ Leftovers
Trait: Teravolt
EVs: 56 HP / 216 Atk / 236 Spd
Lonely Nature (+Atk, -Def)
- Substitute
- Fusion Bolt
- Focus Blast/Ice Beam
- Dragon Claw
Enough speed to get past Jolly Mamoswine and Dragonite because there's literally no reason not to and the latter gets OHKO'd thanks to TeraVolt. Focus Blast has a shot of 2HKO'ing Ferrothorn, the main switchin to Kyurem-B:
0 SpA Teravolt Kyurem-B Focus Blast vs. 252 HP / 0 SpD Ferrothorn: 178-210 (50.5 - 59.6%) -- 82.4% chance to 2HKO after Leftovers recovery
Some are SpDef based, but that's significant damage either way, with any prior damage that's a solid 2HKO. Other significant 2HKO's are Excadrill and Tyranitar in Sand. Ice Beam can be used to kill Landorus-T's and Gliscors more easily, but has less use otherwise. EV's for making a 101 Sub, Dragon Claw actually has a shot at 2HKO'ing Bold Blissey with maxed out defenses, so it's forced to WishProtect, it can't kill your Sub in one hit and you're getting Lefties all the time. Florges and Sylveon are 2HKO'd by Fusion Bolt with this spread, while Togekiss and Azumarill are OHKO'd after SR.
All-out Attacker:
Kyurem (Kyurem-B) @ Life Orb
Trait: Teravolt
EVs: 20 HP / 252 Atk / 236 Spd
Lonely Nature (+Atk, -Def)
- Outrage
- Fusion Bolt
- Iron Head
- Earth Power
Full investment in Outrage which is the main attraction of this set, every wall barring Steel-types is 2HKO'd. Fusion Bolt hits the bulky waters while Iron Head hits Fairies and T-tars, Earth Power hits the Rotom-W's and Heatrans. Simple enough.
Choice Band:
Kyurem (Kyurem-B) @ Choice Band
Trait: Teravolt
EVs: 252 Atk / 20 Def / 236 Spd
Adamant Nature (+Atk, -SAtk)
- Outrage
- Sleep Talk
- Fusion Bolt
- Iron Head
I would highly advise against using this set now because of Fairy-types. The Life Orb set outclasses it by a mile. EV's maximize Atk again and outspeed Jolly Dnite. The rest is dumped into defense to take priority moves slightly better. Honestly you should only use this set on MagDrag to lure in Steels, and even then you might as well use the LO set.
Substitute Attacker:
Kyurem (Kyurem-B) @ Leftovers
Trait: Teravolt
EVs: 56 HP / 216 Atk / 236 Spd
Lonely Nature (+Atk, -Def)
- Substitute
- Fusion Bolt
- Focus Blast/Ice Beam
- Dragon Claw
Enough speed to get past Jolly Mamoswine and Dragonite because there's literally no reason not to and the latter gets OHKO'd thanks to TeraVolt. Focus Blast has a shot of 2HKO'ing Ferrothorn, the main switchin to Kyurem-B:
0 SpA Teravolt Kyurem-B Focus Blast vs. 252 HP / 0 SpD Ferrothorn: 178-210 (50.5 - 59.6%) -- 82.4% chance to 2HKO after Leftovers recovery
Some are SpDef based, but that's significant damage either way, with any prior damage that's a solid 2HKO. Other significant 2HKO's are Excadrill and Tyranitar in Sand. Ice Beam can be used to kill Landorus-T's and Gliscors more easily, but has less use otherwise. EV's for making a 101 Sub, Dragon Claw actually has a shot at 2HKO'ing Bold Blissey with maxed out defenses, so it's forced to WishProtect, it can't kill your Sub in one hit and you're getting Lefties all the time. Florges and Sylveon are 2HKO'd by Fusion Bolt with this spread, while Togekiss and Azumarill are OHKO'd after SR.
All-out Attacker:
Kyurem (Kyurem-B) @ Life Orb
Trait: Teravolt
EVs: 20 HP / 252 Atk / 236 Spd
Lonely Nature (+Atk, -Def)
- Outrage
- Fusion Bolt
- Iron Head
- Earth Power
Full investment in Outrage which is the main attraction of this set, every wall barring Steel-types is 2HKO'd. Fusion Bolt hits the bulky waters while Iron Head hits Fairies and T-tars, Earth Power hits the Rotom-W's and Heatrans. Simple enough.
Choice Band:
Kyurem (Kyurem-B) @ Choice Band
Trait: Teravolt
EVs: 252 Atk / 20 Def / 236 Spd
Adamant Nature (+Atk, -SAtk)
- Outrage
- Sleep Talk
- Fusion Bolt
- Iron Head
I would highly advise against using this set now because of Fairy-types. The Life Orb set outclasses it by a mile. EV's maximize Atk again and outspeed Jolly Dnite. The rest is dumped into defense to take priority moves slightly better. Honestly you should only use this set on MagDrag to lure in Steels, and even then you might as well use the LO set.