Mabosstiff @ Toxic Orb / Black Sludge  
Ability: Guard Dog  
Tera Type: Ghost / Ice / Rock
EVs: 252 Spe  
Naive Nature  
IVs: 2 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Substitute  
- Taunt  
- Roar  
- Protect / Pain Split / Curse

Mabosstiff

Mabosstiff has a small niche as a Pokemon immune to phazing (thanks to its ability Guard Dog) that can itself phaze with Roar. Thanks to being a Dark-type, it also pretty much ignores Pranksters, and it even gets to punish them with Taunt. This lets it be a great Pokemon to Perish Pass to in more dedicated Perish Pass teams. Mabosstiff needs to be Naive (or use Black Sludge) in order to be guaranteed OHKOed by Gholdengo Steel Beam. Note that Toxic Orb lets Mabosstiff KO itself faster since it tends to stay in, but Black Sludge and 2 HP IVs can be used to enable a self-2HKO with Black Sludge and Substitute into Tera Ghost Curse. Tera Ghost lets Mabosstiff escape trappers instead of needing to Roar them out along with enabling Ghost Curse, while Tera Ice makes Mabosstiff weak to Steel Beam and Stealth Rock, and Tera Rock makes Mabosstiff weak to Steel Beam and Chloroblast (to the point that Electrode-H Chloroblast OHKOes Naive it).

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