Gen 8 SS Monotype Assault Vest Pivot (Flying)
Tornadus-Therian (M) @ Assault Vest
Ability: Regenerator
EVs: 96 HP / 244 SpA / 168 Spe
Timid Nature
- Grass Knot
- Heat Wave
- Knock Off
- U-turn
Assault Vest Tornadus-Therian is used to decently check special attackers such as Hydreigon and Nidoking in Gen 8 SS Monotype. This set also doesn't have a STAB move.(note 1) Grass Knot is used as a lure for Mamoswine, as you can bait it to come in/stay in, then use Grass Knot for a decent (75%) chance to OHKO it. Grass Knot can also be used on Pokemon such as Swampert and Seismitoad. Heat Wave threatens Steel-types such as Ferrothorn, Jirachi, Celesteela, and Corviknight. Knock Off allows you to cripple Pokemon such as Celesteela, Heatran, and Toxapex by removing their crucial items. Knock Off in conjunction with Heat Wave allows Tornadus-Therian to annoy Steel-types in the Steel matchup. U-Turn allows you to chip opposing Pokemon and bring in a teammate. U-Turn is also useful for activating Regenerator, allowing you to recover HP. Knock Off and U-Turn are used for utility, not for doing as much damage as possible.(note 2)
244 Special Attack EVs are used to achieve the damage roll of Grass Knot having a 75% chance to OHKO non Assault Vest Mamoswine. If Stealth Rock is on the opposing team's side, Grass Knot is a guaranteed OHKO. 168 Speed EVs is enough to outspeed Pokemon such as Latios and non Choice Scarf Gengar. 96 HP EVs are leftover EVs.
Moveset Notes
Note 1: Grass Knot is used over STAB Hurricane for the damage roll to OHKO Mamoswine. If you want to have STAB Hurricane, you can replace Grass Knot with Hurricane. If you do this, you should change the EV spread to a more bulkier one, as the Special Attack EVs is literally for Grass Knot having a good damage roll to OHKO Mamoswine. Make sure to have at least 168 Speed EVs to outspeed the Pokemon I mentioned earlier(non Scarf Gengar, Latios).
Note 2: I already said it earlier, but I'll say it again: Knock Off and U-Turn are not, I repeat, NOT used for doing as much damage as possible. The moves are used for utility- Knock Off removing items and U-Turn letting you switch out while chipping opposing Pokemon.