How the Volts Have Turned

Tapu Koko @ Choice Scarf  
Ability: Electric Surge  
Shiny: Yes  
EVs: 252 SpA / 36 SpD / 220 Spe  
Timid Nature  
IVs: 0 Atk  
- Volt Switch  
- Thunderbolt  
- Hidden Power [Ice]  
- Grass Knot

Victini @ Choice Band  
Ability: Victory Star  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- V-create  
- Bolt Strike  
- Brick Break  
- U-turn

Tapu Fini @ Aguav Berry  
Ability: Misty Surge  
EVs: 252 HP / 188 Def / 16 SpD / 52 Spe  
Calm Nature  
IVs: 0 Atk  
- Taunt  
- Whirlpool  
- Nature's Madness  
- Defog

Ferrothorn @ Leftovers  
Ability: Iron Barbs  
EVs: 252 HP / 48 Def / 208 SpD  
Sassy Nature  
IVs: 0 Spe  
- Stealth Rock  
- Leech Seed  
- Protect  
- Gyro Ball

Tornadus-Therian @ Flyinium Z  
Ability: Regenerator  
Shiny: Yes  
EVs: 4 Atk / 252 SpA / 252 Spe  
Timid Nature  
- U-turn  
- Hurricane  
- Knock Off  
- Taunt

Greninja (M) @ Focus Sash  
Ability: Protean  
EVs: 252 Atk / 4 SpA / 252 Spe  
Hasty Nature  
- Gunk Shot  
- Low Kick  
- Ice Beam  
- Spikes

by Singler

Koko has enough Speed on it to outspeed Adamant Zygarde at +2 as well as M-Swamp in the rain and +2 Gyarados (and everything it normally can still if scarf is Knocked Off), leftovers put into SpDef to switch into Zapdos and Torn better -- Brick Break to OHKO Tyranitar while also 2hko-ing max HP Heatran which can be a common switch-in (though Bolt Strike in Terrain also 2hkos), Zen Headbutt could maybe be used over Brick Break -- Fini spread from one of your videos, but I couldn't find which one unfortunately (it was the most SpDef one I could find that wasn't max that was also still useful in the tier), Moonblast can be run over Defog since you're running dual hazards, though I find especially if I haven't set any up yet that it can be handy removing Rocks for Victini especially and Torn, Trapping Set for removing Stall threats or other things that can check Koko or Victini -- StandardPro-Seed w/ Leftovers for most recovery, though Rocky Helmet can be used to chip things down for offensive threats, Gyro Ball to mainly break Kyurems Sub while still doing decent damage, Protect or Gyro can be interchanged with Knock-Off, Power Whip, or whatever else you choose -- Could run All-Out Pummeling to better deal with Tyranitar or Heatran over Taunt or Knock-Off, but this set still puts in work -- Best Coverage for the tier, Low Kick KOing Heatran after hazards depending on HP investment, GShot to remove annowing threats stopping Koko, and Ice Beam to KO Zygarde, non Scarf Landos, and deal a good amount to the annoying Zapdos, Life Orb can work too on this set but Sash lets it live big hits from +1 mon (ex Zygarde, M-Tyranitar) or certain Scarfers so it can still do it's thing

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