>>41601805I use:
Zacian
Lvl 100
Jolly (Adamant works too)
252atk/4def/252spe
@Rusted Sword
-Iron Head (Behemoth Blade when in battle)
-Sacred Sword
-Play Rough
-Swords Dance/Wild Charge/Psychic Fangs
Moves in that order. Behemoth blade is 150 base power after stab, and its bonus basically means it hits like a super-effective move on dynamax pokes. Slot 1 is chosen, because less scrolling is good.
Sacred Sword is next, primarily used to kill Ditto in lobbies where it cannot transform. The animation time for Behemoth is loooong, and a Super-effective Sacred takes ditto's health down to the shield proc hardline anyways.
Last 2 moves are preference. Play Rough because good stab, already used PP Ups on it anyways. Swords Dance is the best way to burn a turn if ever needed, such as when another slower pokemon wants to status the boss, but your faster hit would cause the boss to bring up shields which negate status. Other moves picked for Super-effective coverage.