Arcanine @ Sitrus Berry  
Ability: Intimidate  
Level: 50  
EVs: 244 HP / 124 Def / 140 SpD  
Careful Nature  
IVs: 0 SpA  
- Flare Blitz  
- Will-O-Wisp  
- Snarl  
- Protect

Unown
Options:
- offensive: Extreme Speed, Close Combat
- supportive: Helping Hand, Morning Sun
- item: Figy Berry

Unown
Offensive calcs:
- -1 0 Atk Arcanine Flare Blitz vs. 68 HP / 4 Def Kartana: 156-184 (109 - 128.6%) -- guaranteed OHKO
Defensive calcs:
- 252 SpA Transistor Regieleki Thunderbolt vs. 244 HP / 140+ SpD Arcanine: 90-106 (45.9 - 54%) -- 12.5% chance to 2HKO after Sitrus Berry recovery
- 252+ SpA Tapu Lele Psychic vs. 244 HP / 140+ SpD Arcanine in Psychic Terrain: 102-121 (52 - 61.7%) -- guaranteed 3HKO after Sitrus Berry recovery
- -1 252+ Atk Landorus-T Earthquake vs. 244 HP / 124 Def Arcanine: 104-126 (53 - 64.2%) -- 3.5% chance to 2HKO after Sitrus Berry recovery
- 252 Atk Urshifu-Rapid Strike Surging Strikes (3 hits) vs. 244 HP / 124 Def Arcanine on a critical hit: 204-252 (104 - 128.5%) -- approx. 6.3% chance to OHKO

Arcanine @ Fightinium Z  
Ability: Intimidate  
Level: 50  
EVs: 252 Atk / 4 SpD / 252 Spe  
Jolly Nature  
IVs: 0 SpA  
- Flare Blitz  
- Protect  
- Close Combat  
- Extreme Speed

Unown
Options:
- offensive: Wild Charge
- supportive: Helping Hand, Snarl, Will-O-Wisp
- item: Firium Z
- Nature: Adamant

Unown
Offensive calcs:
- 252 Atk Arcanine All-Out Pummeling (190 BP) vs. 252 HP / 0 Def Mega Empoleon: 190-224 (99.4 - 117.2%) -- 93.8% chance to OHKO
- 252 Atk Arcanine All-Out Pummeling (190) vs. 252 HP / 0 Def Mega Walrein: 212-250 (97.6 - 115.2%) -- 81.3% chance to OHKO
- 252 Atk Arcanine Extreme Speed vs. 252 HP / 0 Def Mega Walrein: 45-53 (20.7 - 24.4%) -- guaranteed 5HKO
- 252 Atk Arcanine Flare Blitz vs. 252 HP / 0 Def Rillaboom: 200-236 (96.6 - 114%) -- 75% chance to OHKO
- 252 Atk Arcanine Extreme Speed vs. 252 HP / 0 Def Rillaboom: 45-53 (21.7 - 25.6%) -- possible 5HKO after Grassy Terrain recovery