Baxcalibur @ Choice Band
Ability: Thermal Exchange
Tera Type: Dragon
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Glaive Rush
- Icicle Crash
- Earthquake
- Ice Shard
I know it looks a little silly to call Baxcalibur a Meowscarada lure since these Pokemon don't really switch in on each other, but in practice Meowscarada users love to use it as a lead since it's a fast, hard hitting pivot. So when you see Meowscarada on the enemy team, you lead Baxcalibur, and the enemy, expecting the typical DD set and not wanting to give it a free turn, either U-Turns out or tries to OHKO with Play Rough. Instead, they get OHKO'd by the rare Banded Ice Shard.
252+ Atk Choice Band Baxcalibur Ice Shard vs. 0 HP / 0 Def Meowscarada: 314-372 (107.1 - 126.9%) -- guaranteed OHKO
...and that's pretty much it. No real gimmick here, no need to burn your tera or waste a move slot, just a very powerful Ice Shard that cleanly OHKO's Meowscarada and is also very useful against Pult, Moon, Garchomp, Dnite, Breloom, and plenty of other weakened offensive threats. Against more defensive teams you get an extremely powerful breaker that has no real reliable switch-ins. Even if the enemy doesn't lead Meowscarada, you may be able to surprise them later on with Ice Shard, which most Bax's don't carry.
As an aside, you can run Jolly if you want to outspeed Timid Gholdengos and speed tie Jolly Tusks. It still usually picks up the OHKO on Meowscarada:
252 Atk Choice Band Tera Dragon Baxcalibur Ice Shard vs. 0 HP / 0 Def Meowscarada: 288-338 (98.2 - 115.3%) -- guaranteed OHKO after Stealth Rock
But for this set, I prefer the extra breaking power, since that's what this guy is here for.