Skarmory @ Black Sludge / Mental Herb
Ability: Weak Armor  
Tera Type: Dark / Ghost / Ice
EVs: 252 Spe  
Jolly Nature  
IVs: 0 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Steel Beam  
- Substitute  
- Whirlwind  
- Taunt / Tailwind / Stealth Rock / Sandstorm / Protect / Curse

Skarmory

Skarmory is tied for the weakest Steel Beam user with access to a phazing move, giving it a niche. That phazing move should be Whirlwind, as multiple Pokemon have access to Imprison, Steel Beam, and Roar. Skarmory also manages to have Taunt to shut off Gothitelle, Gothita, and friends, and it can also use a rather wide variety of other support moves, including Tailwind, Stealth Rock, Sandstorm, Protect, and Curse. Skarmory's best ability is Weak Armor to speed up and lose Defense when hit with physical attacks such as Struggle, Knock Off, and Nuzzle. Black Sludge enables the self-2HKO with Substitute into Steel Beam. Mental Herb can be used if Skarmory is the dedicated Tera (Ghost) user of the team to enable a hard-to-disrupt Ghost Curse-Steel Beam self-2HKO. Skarmory should be Jolly so its Steel Beams are as weak as possible, even though it still OHKOes Shroodle, Diglett, Cottonee, and more. Skarmory takes advantage of the typical Tera options to dodge Pranksters, escape trappers, or become weak to Stealth Rock and Steel Beam. Only use Curse with Tera Ghost.

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