Scrafty @ Leftovers  
Ability: Intimidate / Shed Skin  
EVs: 252 HP / 4 Def / 252 SpD  or 252 HP / 176 SpD / 80 Spe
Careful Nature  
- Roar  
- Knock Off  
- Rest  
- Sleep Talk / Bulk Up
1) A great BnB choice for all Future Sight users due to its ability to handle opposing Dark- and Ghost-types well. Articuno-G often draws in Gigalith, while Exeggutor and Lunatone draw in specially defensive Pokemon. When paired with Lunatone, the core provides a lot of coverage against Charizard
2) Future Sight helps it greatly as it can generate a free turn for it to pressure something with Knock Off or Bulk Up. This leverage is created through offensive Fighting- and Fairy-types not being able to switch in, and Roar against Aromatisse switch-ins.

Aggron @ Leftovers  
Ability: Rock Head
EVs: 252 HP / 252 SpD / 4 Spe  or 252 HP / 112 SpD / 144 Spe  
Careful Nature  
- Stealth Rock  
- Head Smash  
- Body Press  
- Roar  
1) Perhaps the easiest SR user to fit on a typical Arti or Eggy Future Sight build, as its resistances come together to fill a ton of gaps. It can probably fit Protect somewhere, but Body Press's damage output on Scrafty and Ferroseed is too hard to ignore.
2) Faster spread can outspeed Drampa, but is slightly worse against Specs Whimsicott as suddenly it can 2HKO with Energy Ball

Persian-Alola @ Heavy-Duty Boots  
Ability: Fur Coat  
EVs: 116 HP / 140 Atk / 252 Spe  
Jolly Nature  
- Foul Play  
- Roar  
- Parting Shot  
- Knock Off  

Persian-Alola @ Metronome  
Ability: Fur Coat  
EVs: 176 HP / 80 Atk / 252 Spe  
Jolly Nature  
- Knock Off  
- Parting Shot  
- Roar  
- Foul Play  
1) Alolan Persian is one of the best Silvally-Ghost counters right now, and is great at pivoting into physical attackers due to its ability, resistance to Knock Off, and Foul Play. All three FS Pokemon greatly appreciate this
2) EVs on the first set are for it to 2HKO opposing Articuno-G with Knock Off unless it recovers initially, while the Metronome set intends to overpower it regardless while retaining the initial 2HKO
3) Even against Passimian, Parting Shot is very safe during a preceding Future Sight attack. Meanwhile it can opt to Roar out Dark-type switch ins and either pressure Regirock with Knock Off + Future Sight

Piloswine @ Eviolite  
Ability: Thick Fat  
EVs: 252 HP / 120 Atk / 136 SpD  
Adamant Nature  
- Stealth Rock  
- Earthquake  
- Icicle Crash  
- Roar  
1) 136 Special Defense lives two Charizard STABs, Lives Drampa's Draco Meteor after SR, takes two Moonblasts from Ribombee (letting it check QD), while still being powerful enough to 2HKO Gigalith even with Protect
2) Scrafty and Mesprit are the primary targets it wants to use Roar against during Future Sight, and it also makes it one of the best counters to Nasty Plot Rotom-Frost. Against other Pokemon, it capitalizes on its Dual STAB to threaten Steel-types and many other Pokemon
3) Articuno-G is an amazing partner as it easily comes in on Gigalith and has that strong Ice resist and Electric immunity. Meanwhile, Articuno-G can handle Weezing and most Mesprit sets, while having a great Grass- and Fighting-resist to pivot into

Silvally-Fairy @ Fairy Memory  
Ability: RKS System  
EVs: 252 HP / 152 Atk / 48 Def / 56 Spe  or 252 HP / 152 Atk / 32 Def / 72 Spe
Impish Nature  
- Multi-Attack  
- U-turn  
- Roar  
- Defog  
1) Amazing Dark-type answer and can even form great momentum cores
2) 152 Atk OHKOs Drampa and Hitmontop, 56 to outspeed Adamant Flapple, Hitmontop, and Poliwrath
3) If pairing with Eggy, 252 HP / 152 Atk / 32 Def / 72 Spe Jolly is a great alternative as it helps in scenarios where you'd need a pivot to Tsareena's Knock Off/U-turn and can outspeed and 2HKO

Druddigon @ Rocky Helmet  
Ability: Rough Skin  
EVs: 252 HP / 252 Def / 4 Spe  
Impish Nature  
- Stealth Rock  
- Dragon Tail  
- Glare  
- Earthquake  

Druddigon @ Leftovers  
Ability: Rough Skin  
EVs: 252 HP / 96 Def / 136 SpD / 24 Spe  
Careful Nature  
- Stealth Rock  
- Dragon Tail  
- Earthquake  
- Glare  
1) Eggy drawing in U-turn users makes Druddigon a great partner. I'd probably use more specially defensive since the Fire resist and ability to avoid a Zard 2HKO from Hurricane would likely be more valued on these types of cores.

Poliwrath @ Leftovers  
Ability: Water Absorb  
EVs: 252 HP / 160 Def / 96 Spe  
Impish Nature  
- Circle Throw  
- Bulk Up / Scald
- Rest  
- Sleep Talk  
1) A Knock Off resilient that can set up on Scrafty or force progress with its kit. 
2) Water Absorb is great for offensive waters trying to punish Lunatone
3) Bulk Up + Toxic Spikes is a very legitimate win con atm. Tour and 1630 usage stats suggest an inclination of Ghost-types like Jellicent, Gourgeist, and Silvally-Ghost, while users with Levitate and Rest on sets are less frequently used!