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For fun calculations:
252+ ATK (Pokemon-style EVs) Primal Groudon Precipice Blades vs. 0 HP / 64 DEF (puppet-style EVs) SukunaD: 246-290 (84.2 - 99.3%) -- guaranteed 2HKO
That's a STAB BP120 move running off of a fully invested base 180 ATK hitting a weakness and it CAN'T ONESHOT. Note that SukunaD is running no HP investment, isn't using a boosting mark for Defense, and isn't holding a Golden Hairpin.
If Primal Groudon is using Earthquake for consistency (but is still Adamant nature) and SukunaD is holding a Golden Hairpin, it gets worse: the damage range drops to 200-236 (58.4 - 69%).
No Adamant Nature and Earthquake? (53.2 - 63.1%). Still a 2HKO, but remarkable given Primal Groudon's base 180 attack.
These are at level 100 however, and TPDP is very heavily focused on doing battles at level 50, whereupon those last two calculations become very different.
252+ ATK Primal Groudon Earthquake vs. +1 0 HP / 64 DEF SukunaD: 72-86 (47.6 - 56.9%) -- 84% chance to 2HKO
Not even a guaranteed 2HKO anymore, and Groudon's still Adamant nature here.
Without it?
252 ATK Primal Groudon Earthquake vs. +1 0 HP / 64 DEF SukunaD: 66-78 (43.7 - 51.6%) -- 2.7% chance to 2HKO
Enough said.
Precipice Blades is still a 2HKO no matter what nature assuming both hit, but there's a 28% chance it misses at least once.
On the other side of things (assuming level 50):
64+ ATK (puppet-style EVS) SukunaD Shooting Press vs. 4/0 DEF (Pokemon-style EVS) Primal Groudon: 104-126 (59 - 71.5) -- Guaranteed 2HKO
If Primal Groudon isn't running Precipice Blades, Swords Dance, or a special attack, and isn't investing in bulk himself, he loses to Golden Hairpin SukunaD barring a crit on his end. This also applies if he is running Precipice Blades and misses once without Swords Dance up, or if SukunaD gets lucky and crits him for the 1HKO.
Primal Groudon is BST 770.
SukunaD is BST 370.
This tiny thing can murder arguably the strongest thing in Ubers. Enough said.