Pinging the person that only plays offense slop to build with beefy mons like this is crazy, but nonetheless I can oblige.
While looking at garganacl I realized something crucial; this mon is beyond garbage, BUT, we can save it with some innovation. I present to you:

Garganacl @ Stone Plate
Ability: Rocky Payload
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stone Edge
- Salt Cure
- Curse
- Stealth Rock / Recover
Now, I know what you're probably thinking, "He'll just get one-tapped by Zamazenta" "this just makes him even more dogshit" "what the fuck were you thinking", and while I was skeptical myself, I decided to test out my hypothesis by bringing it to the pinnacle of AAA battling,
Ladder.
Here are my results:
https://replay.pokemonshowdown.com/gen9almostanyability-2493961477-nu1duen15ud2u6wv2tbdt6j1fffkh3rpw As we can see, the mere presence of Garganacl forces the opponent to lead something that can of course immediately pressure it, which in this case was Samurott-Hisui. This simple play by them brought their downfall, as I was quickly able to set up my board with EE Iron Hands & WBB Sinistcha, quickly sealing the opponents fate, all thanks to Garganacl giving me the lead advantage.
https://replay.pokemonshowdown.com/gen9almostanyability-2493962452-wb0k2014x9pf1rv8f4lyneast2na5fdpw Now this match starts off a little differently, but after a bit of squabble Garganacl is able to enter the field and click Stealth Rock (1) time and get off crucial chip on the Quaquaval. After a couple more turns I manage to get the advantage, and at turn 18 Garganacl enters the field. Left with no switchins to Stone Edge & Salt Cure, the opponent disconnects in a fit of rage, netting me yet another victory.
https://replay.pokemonshowdown.com/gen9almostanyability-2493966849-nubehfd589l47bsgypip4to9jsxrkmdpw This match is similar to the first replay; we mindcontroll the opponent into respecting the Garganacl and leading Great Tusk, letting my Iron Hands quickly set up a Sub + a Swords Dance, and again this alone gives me enough advantage to force the opponent into a forfeit
With all this in mind we can conclude that this mon is capable of not only dealing massive damage (cmon, 21% to a quaquaval is pretty impressive) but also mindcontrolling the opponent into always netting you a early advantage in the lead matchup. I hope this is sufficient and is what you were looking for
UT