Shellos @ Black Sludge  
Ability: Sticky Hold  
Tera Type: Dark / Ghost / Ice / Rock
EVs: 252 Spe  
Hasty Nature  
IVs: 2 HP / 0 Atk / 0 Def / 0 SpA / 0 SpD  
- Substitute  
- Protect  
- Stealth Rock
- Sandstorm / Spit Up / Pain Split / Curse

Shellos

Shellos is a Sticky Hold user - therefore immune to Trick and Switcheroo and a great Knock Off switch-in - that knows Stealth Rock. Shellos can otherwise use Sandstorm to chip itself and teammates (and often opponents), Spit Up to deal no damage if Taunted, or Pain Split to go for cutting its own health and healing its opponent. Only use Curse with Tera Ghost. Shellos's hit-and-run nature encourages it to use Black Sludge. Shellos is Hasty to take more damage from opposing Struggle, as it is not OHKOed by any viable Steel Beam users. 2 HP IVs make Shellos's max. HP divisible by 8, just in case you opt for Tera Ghost Curse on this. Tera Dark lets Shellos dodge Pranksters, while Tera Ghost lets it escape trappers, Tera Ice lets it become much better Steel Beam and Stealth Rock fodder, and Tera Rock lets it become much better Steel Beam fodder while still letting it be OHKOed by Electrode-H Chloroblast.

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