Zacian - Hero of Many Battles

With Zacian holding Rusted Sword, its second form (Crowned Sword) is activated and then becomes Fairy/Steel type. While in its Crowned Sword form, the move Iron Head becomes Behemoth Blade for the whole duration of the battle.

POKEFELLA BUILD

Zacian @ Rusted Sword
Ability: Intrepid Sword
EVs: 252 Atk / 6 Def / 252 Spe
Jolly Nature
- Swords Dance
- Iron Head
- Play Rough
- Close Combat

If you want a build other than what is shown here, you can choose the listing Any Custom Pokemon.