Zacian @ Rusted Sword (Ultra Shiny) LV. 100
Ability: Intrepid Sword
EVs: 12 HP/ 236 Atk / 4 Def / 4 SpD / 252 Spe
- Iron Head
- Play Rough
- Sacred Sword
Zacian-C's monstrous stats, solid defensive typing, and immediately threatening power due to Intrepid Sword make it one of the best Restricted Pokemon in the Series 10 metagame. Behemoth Blade is a consistent STAB move that makes swift work of the likes of Xerneas and Tapu Lele while even threatening OHKOs on neutral targets such as Calyrex-S and Landorus. Sacred Sword and Close Combat let Zacian-C dent Pokemon that resist its Behemoth Blade such as Incineroar, Regieleki, and Entei. Sacred Sword is noticeably weaker than Close Combat; however, the lack of defense dropping can be crucial for Zacian-C's longevity. On the other hand, Close Combat is useful for OHKOing Stakataka and physically defensive Incineroar at +1 Attack. Substitute is an excellent move for Zacian-C, keeping it safe from Intimidate, Fake Out, and status, and it capitalizes well on opponents looking to play around it defensively. Play Rough as a third attack notably hits the likes of Thundurus, Urshifu-R, and Zapdos, which don't particularly mind taking a Behemoth Blade or Fighting-type coverage move. Swords Dance is a fringe option that gives Zacian-C another way to counteract Intimidate, and it typically gives the user an excuse to invest more in its bulk. The given EV spread simply allows Zacian-C to make four Substitutes, with the Attack investment still allowing it to always OHKO 4 HP Calyrex-S with Behemoth Blade.
Zacian-C works best when it can be brought into battle safely, and, as such, it appreciates being paired with pivots like Incineroar, Rillaboom, and Regieleki. These pivots can also provide it with various means of offensive support such as Fake Out, Electroweb, Dark-type coverage for Calyrex-S, and Grass- and Electric-type coverage for Kyogre. Landorus, Urshifu-R, and Landorus-T all pressure Incineroar, which is great for keeping Zacian-C's Attack as high as possible while in battle. It is worth noting, however, that Zacian-C is a fairly low-maintenance Pokemon and can work with almost any viable Pokemon as a partner.
Pokemon Sword and Shield Ultra Shiny Zacian 6IV-EV Trained: https://pokemon4ever.org/products/pokemon-sword-and-shield-ultra-shiny-zacian-6iv-ev-trained