Palossand exists.
252 Atk Great Tusk Knock Off (97.5 BP) vs. 252 HP / 252+ Def Palossand: 146-172 (39 - 45.9%) -- guaranteed 3HKO
Palpssand also sets up Stealth Rock, has better recovery, and can threaten to 2HKO Offensive Great Tusk.
Hell, Rotom (original form) can technically do this too.
252 Atk Great Tusk Knock Off vs. 252 HP / 252+ Def Rotom: 122-144 (40.1 - 47.3%) -- guaranteed 3HKO
Also if Offensive Great Tusk runs Earthquake, it can 2HKO Houndstone after chip and using Booster Energy.
252 Atk Protosynthesis Great Tusk Earthquake vs. 252 HP / 252+ Def Houndstone: 154-183 (44.2 - 52.5%) -- 80.1% chance to 2HKO after Stealth Rock and Leftovers recovery
Not to mention that Earthquake Choice Band straight up 2HKOs Houndstone.
252 Atk Choice Band Great Tusk Earthquake vs. 252 HP / 252+ Def Houndstone: 178-210 (51.1 - 60.3%) -- 89.8% chance to 2HKO after Leftovers recovery
Fair point, forgot about the Sand. However, Houndstone has these things to distinguish itself from Palossand:
1. Way higher bulk vs contact moves. I used this Mon in Ubers and it tanked crazy stuff there, like Band Crunch from Chien Pao.
2. Fewer weaknesses.
3. Body Press.
4. WoW.
5. Roar.
Regarding the moves, it of course can't run them all at the same time and using Restalk (or Rest alone,but for different reasons) limits it too, while Palossand has Shore Up and even Stealth Rock. However, the dog still has a decent niche in my opinion, not OU, but not unranked either.
Also, Restalk Houndstone easily walls most Sneasler sets, that one Mon everyone is fearing (Palossand does it too, but takes higher damage from Night Slash and can't burn it, so Tera Sneasler has it easier).