Darkrai @ Black Sludge  
Ability: Bad Dreams  
Tera Type: Ice / Rock / Ghost
EVs: 252 Spe  
Naive Nature  
IVs: 6 HP / 0 Def / 0 SpD  
- Substitute  
- Taunt  
- Thunder Wave  
- Protect / Curse

Darkrai @ Sitrus Berry / Pecha Berry
Ability: Bad Dreams  
Tera Type: Ice / Rock
EVs: 252 Spe  
Naive / Hasty Nature  
IVs: 1 HP / 0 Def / 0 SpD  
- Trick  
- Substitute  
- Taunt  
- Thunder Wave

Darkrai

Darkrai is the current fastest Dark-type non-Prankster Pokemon that can Trick/Switcheroo, giving it a niche. Darkrai also knows the disruptive Taunt and Thunder Wave, and it can even use Tera Ghost Curse. Naive Black Sludge Darkrai is OHKOed by Gholdengo Steel Beam. Use 1 HP IV if Tricking Sitrus Berry (so Darkrai's max. HP is odd), 6 HP IVs if using Curse so Darkrai's max. HP is divisible by 8 to enable the Black Sludge and Substitute-Tera Ghost Curse self-2HKO, and 0 HP IVs otherwise. Darkrai is a legendary who needs 3 perfect IVs, so put them into its great Speed, unused Special Attack, and rarely used Attack. An adept Taunter who can ward off trappers with that move, Darkrai prefers Tera Ice to become weak to Steel Beam and Stealth Rock, Tera Rock to become weak to Steel Beam and get OHKOed by Electrode-H Chloroblast, or Tera Ghost to enable Curse.

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