>>31845809252+ Atk Life Orb Arcanine Flare Blitz vs. 180 HP / 148+ Def Celesteela: 203-242 (104.1 - 124.1%) -- guaranteed OHKO
252+ Atk Life Orb Arcanine Flare Blitz vs. 252 HP / 252+ Def Celesteela: 187-221 (91.6 - 108.3%) -- 50% chance to OHKO
Celesteela has to be literal max defense to deal with arcanine, and even if it DOES survive,
-1 0 Atk Celesteela Earthquake vs. 0 HP / 0 Def Arcanine: 62-74 (37.5 - 44.8%) -- guaranteed 3HKO
And that's singles damage.
252 SpA Life Orb Tapu Koko Thunderbolt vs. 180 HP / 148+ SpD Celesteela in Electric Terrain: 190-226 (97.4 - 115.8%) -- 87.5% chance to OHKO.
If you're playing doubles Arcanine should be on your team, and it sure as FUCK isn't running EQ if it wants to fit both thrower and Heavy slam to be able to deal damage.