Landorus-Therian @ Leftovers
Ability: Intimidate
Tera Type: Water
EVs: 60 HP / 88 Atk / 32 Def / 104 SpD / 224 Spe
Jolly Nature
- Imprison
- Swords Dance
- Earthquake
- Facade
(I would have loved to submit a Primarina Sparkling Aria set here, constantly healing Luna's burn, but alas, no can do)
It's pretty common knowledge by now that Landorus-Therian, the ex-King of OU, has fallen off. And this is made evident by the below calc:
-1 252+ Atk Guts Ursaluna Facade (140 BP) vs. 252 HP / 252+ Def Landorus-Therian: 204-241 (53.4 - 63%) -- guaranteed 2HKO
So, the Ursaluna user will for sure swap in, expecting to establish its dominance as the stronger ground type. If Luna swaps into Landorus, it gets to fire off a full-power Facade without worrying about Intimidate. The best Landorus can do is try to swap in on an Earthquake. Predict wrong, and it gets 2 shot. What can the Landorus do?
Well, it can just casually block out every relevant move that Ursaluna can use. Facade? Earthquake? As long as Landorus is on the field, that'll be child's play. No Swords Dance either to boost the already pathetic damage that Fire Punch is doing.
-1 252+ Atk Guts Ursaluna Fire Punch vs. 60 HP / 32 Def Landorus-Therian: 100-118 (29.9 - 35.3%) -- guaranteed 4HKO after Leftovers recovery
If it really bothers you, Tera Water halves the damage that Luna
can do, as well as increases the offensive capabilities of Landorus. From there, 224 speed with a Jolly nature is there to outrun max speed Baxcalibur and Great Tusk. With Swords Dance, Landorus can very easily become a potent breaker, especially since it turns Ursaluna into setup fodder. 145 base attack alongside SD means that we can afford to invest EVs into Landorus' ability to survive. The HP and Defence investment allows it to survive a +1 Protosynthesis Attack Roaring Moon Crunch, which can be helpful with finishing it off if it gets dangerous. Similarly, 60HP and 104SpD are to survive a Choice Specs Dragapult Draco Meteor.
TLDR: We turn Ursaluna into setup fodder, and a +2 Landorus-Therian is extremely scary, even when limited to just Ground and Normal coverage.