>>22942348It's a non-STAB, non-boosted 65 base power attack.
With that in mind, I find it somewhat impressive that it can still solidly 2HKO Ferrothorn.
For consistency, I'll slap CB on it.
252+ Atk Choice Band Donphan Fire Fang vs. 252 HP / 88+ Def Ferrothorn: 296-352 (84 - 100%) -- 6.3% chance to OHKO
252+ Atk Choice Band Tepig Fire Fang vs. 252 HP / 88+ Def Ferrothorn: 300-352 (85.2 - 100%) -- 6.3% chance to OHKO
I know that Tepig doesn't get Fire Fang, but that's literally how much of a difference STAB makes (base 63 Attack versus base 120).