Eevee @ Eevium Z  
Ability: Adaptability  
Level: 50  
EVs: 252 HP / 4 Def / 252 Spe  
Jolly Nature  
- Last Resort  
- Baton Pass  
- Helping Hand  
- Protect  

Salamence @ Choice Specs  
Ability: Intimidate  
Level: 50  
EVs: 252 SpA / 4 SpD / 252 Spe  
Modest Nature  
IVs: 0 Atk  
- Draco Meteor  
- Flamethrower  
- Hydro Pump  
- Hyper Voice  

Incineroar @ Firium Z  
Ability: Blaze  
Level: 50  
EVs: 4 HP / 252 Atk / 252 Spe  
Adamant Nature  
- Flare Blitz  
- Darkest Lariat  
- Earthquake  
- Fake Out  

Clefairy @ Eviolite  
Ability: Friend Guard  
Level: 50  
EVs: 252 HP / 140 Def / 116 SpD  
Sassy Nature  
IVs: 0 Atk  
- Follow Me  
- After You  
- Heal Pulse  
- Protect  

Tapu Fini @ Wiki Berry  
Ability: Misty Surge  
Level: 50  
EVs: 248 HP / 244 Def / 4 SpA / 4 SpD / 8 Spe  
Calm Nature  
IVs: 0 Atk  
- Calm Mind  
- Psych Up  
- Muddy Water  
- Moonblast  

Kartana @ Assault Vest  
Ability: Beast Boost  
Level: 50  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Leaf Blade  
- Night Slash  
- Smart Strike  
- Sacred Sword  

And for the additional mon on here that you can swap Incineroar for, it's a nice tech for the evoboost team. Power Trip Scarf Krookodile.
Krookodile @ Choice Scarf  
Ability: Intimidate  
Level: 50  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
- Power Trip  
- Earthquake  
- Crunch  
- Rock Slide  

Here are some damage calcs for when it's at +2 (with the evoboost) :

+2 252 Atk Krookodile Power Trip vs. 4 HP / 0 Def Tapu Koko: 199-234 (136.3 – 160.2%) — guaranteed OHKO

+2 252+ Atk Krookodile Power Trip vs. 252 HP / 4 Def Tapu Bulu: 168-198 (94.9 – 111.8%) — 68.8% chance to OHKO

+2 252 Atk Krookodile Power Trip vs. 4 HP / 0 Def Garchomp: 364-429 (197.8 – 233.1%) — guaranteed OHKO

+2 252+ Atk Krookodile Power Trip vs. 252 HP / 76 Def Tapu Fini: 158-186 (89.2 – 105%) — 37.5% chance to OHKO

+2 252+ Atk Krookodile Power Trip vs. 252 HP / 252+ Def Eviolite Porygon2: 196-232 (102 – 120.8%) — guaranteed OHKO

+2 252 Atk Krookodile Power Trip vs. 252 HP / 44 Def Muk-Alola: 207-243 (97.6 – 114.6%) — 81.3% chance to OHKO

+2 252 Atk Krookodile Power Trip vs. 252 HP / 252+ Def Celesteela: 246-291 (120.5 – 142.6%) — guaranteed OHKO

+2 252 Atk Krookodile Power Trip vs. 252 HP / 0 Def Hariyama: 261-307 (103.9 – 122.3%) — guaranteed OHKO

So it's definitely something to consider. Now for an overall guide to the team...

You generally almost always want to lead Eevee + Clefable (when matchup is favorable). That's this team's first mode. The point here is to allow Eevee to get a boost with Friend Guard Clefairy by using follow me to redirect attacks to it, while Eevee boost and baton passes onto another mon. 

Your form of speed control would also be clefairy, as it has After you in order to make your boosted mon become faster than other mons under trick room in the process, since Clef at min speed underspeeds almost everything except some torkoal variations, gigalith, etc. Clef also carries heal pulse to heal your teammates once they switch in, since they'll most likely be targetted by the opposition.

The point with this Evoboost squad is to baton pass to either Salamence, Incineroar, or Kartana first. (Or Krookodile if you plan to use it on this team over Salamence or Incineroar), then switch in Tapu Fini, Psych Up the boosts from your partner, and proceed to sweep with two boosted mons.

Now, for Mode #2 of this team - No Evoboost. 
Once opposing teams see that you're bringing Eevee and Clefairy on team preview, they'll most likely try to lead off with mons that are strong against them or can phase them out (like roar arcanine, etc.)

In this case, you dont bring the eevee (clefairy can still be useful with friend guard and follow me, but it's not necessary.) 
Mainly when I use this team, I end up leading Incineroar + Salamence for the second mode, with Kartana and Fini in the back. 
Incineroar has Fake Out pressure + Z move, and Specs Modest Salamence hits hard. Also, Incineroar runs Earthquake, and obviously that helps with having salemence as a partner.

Fini and Kartana are good switch ins for these mons as they help cover a lot of what they oppose, and are good for late game. Intimidate shuffle + fake out shuffle possibility as well with switching in Mence and Incineroar as well..

Hope you enjoy this team, Its a lot of fun. :)