Uber Volt Turn
Zekrom @ Choice Scarf
Ability: Teravolt
EVs: 252 Atk, 252 Speed, 4 HP
Nature: Adamant
- Fusion Bolt
- Dragon Claw
- Outrage
- Volt Switch
Genesect @ Choice Scarf/ Expert Belt
Ability: Download
EVs: 252 Sp. Atk, 252 Speed, 4 HP
Nature: Modest/ Timid
- Bug Buzz
- Ice Beam
- Flame Thrower
- U-Turn
So this duo sees Zekrom taking Water, Fire and Electric hits, while Genesect takes the Dragon and Ice hits while being fully able to deal super-effective damage back to the those types.
There's that awkward Ground synergy, as Genesect has a x1 neutrality and not very good defences, but that's what flying types/ Levitiate Pokemon are for.
UU Volt Turn
Victini @ Choice Scarf/ Band
Ability: Victory Star
EVs: 252 Atk, 252 Speed, 4 HP
Nature: Adamant/ Jolly
- V-Create
- Zen Headbutt
- Bolt Strike
- U-Turn
Rotom-C @ Leftovers
Ability: Levitate
Nature: Calm
EVs: 252 HP, 252 Sp. Def, 4 Speed
- Will-O-Wisp
- Volt Switch
- Leaf Storm
- Pain Split
This pair sees Victini take Fire and Ice hits while Rotom-C takes the Water and Ground hits. There's plenty of gaps here - Bug is still x1 for Victini, and Poison is x2 for Rotom-C while Rock is x1 but Leaf Storm will be super effective. There's no Dark or Ghost coverage, but still, I'll assume that these aren't the only Pokemon on your team.
NU Volt Turn
Emolga @ Flying Gem
Ability: Motor Drive
Nature: Adamant/ Jolly
EVs: 252 Atk, 252 Speed, 4 HP
- Acrobatics
- Encore
- Roost
- U-Turn/ Volt Switch
Lumineon @ Damp Rock
Ability: Swift Swim
Nature: Modest
EVs: 252 HP, 252 Sp. Atk, 4 Speed
- Rain Dance
- Surf
- Ice Beam
- U-Turn
I know that this is far from the perfect pair, but still, Emolga manages to take the Electric hits with Motor Drive, and Lumineon will take the Ice hits.
The Lumineon set doesn't have to be a Rain Dance one, but then again, what else are you going to use it for.
I put an Acrobatics set for Emolga, but a Thunder set is possible as well due to Rain Dance. U-Turn is actually preferable for Acro-Emolga because it's a physical set, and Volt Switch is useless against Ground types like Golurk (which is an ever threat in NU).