Arcanine (M) @ Choice Band
Ability:
Intimidate / Flash Fire (doesn,t matter for Garg, Intimidate tends to be better).
Tera Type:
Normal / Fairy / Firy / Electric / Fight / Fairy (again, doesn,t matter for Garg, probably Normal and Fairy are the best)
EVs: 252 Atk / 4 Def / 252 Spe (Speed doesn,t matter for Garg, only Max Attack is really needed)
Adamant Nature
- Close Combat
- Flare Blitz
- Wild Charge
- Extreme Speed / Play Rough / Sleep Talk (this slot doesn,t matter either. Espeed with Tera Normal, Play Rough with Fairy, Sleep Talk if you hate the mushrooms).
The few Arcanines seen in OU are all Defensive with WoW, a very atractive target for Garganacl. However, this one is band and completely destroys the incoming Rock, regardless of Tera (if predicts correctly the switch-in):
252+ Atk Choice Band Arcanine Close Combat vs. 252 HP / 4 Def Garganacl: 306-360 (75.7 - 89.1%) -- guaranteed 2HKO after Leftovers recovery.
252+ Atk Choice Band Arcanine Flare Blitz vs. 252 HP / 4 Def Tera Fairy Garganacl: 229-270 (56.6 - 66.8%) -- guaranteed 2HKO after Leftovers recovery
252+ Atk Choice Band Arcanine Wild Charge vs. 252 HP / 4 Def Tera Water Garganacl: 228-270 (56.4 - 66.8%) -- guaranteed 2HKO after Leftovers recovery
Even if Garganacl switches out after the first hit, with his terrible Speed he will have troubles coming again in almost everything, except the most passive walls.