Deoxys-Speed @ Black Sludge  
Ability: Pressure  
Tera Type: Dark / Ice 
EVs: 252 Spe  
Naive / Hasty / Timid Nature  
IVs: 6 HP / 0 Atk / 0 SpD  
- Substitute  
- Taunt  
- Imprison / Stealth Rock / Thunder Wave / Knock Off / Trick Room
- Teleport / Imprison / Thunder Wave / Knock Off / Trick Room

Deoxys-Speed @ Sitrus Berry / Pecha Berry
Ability: Pressure  
Tera Type: Dark  
EVs: 252 Spe  
Naive Nature  
IVs: 1 HP / 0 Def / 0 SpD  
- Trick  
- Substitute  
- Taunt  
- Teleport / Imprison / Thunder Wave / Trick Room

Deoxys-Speed @ Toxic Orb  
Ability: Pressure  
Tera Type: Dark  
EVs: 252 HP / 252 Spe  
Hasty / Timid Nature  
IVs: 0 Atk / 0 Def / 0 SpD  
- Substitute  
- Taunt  
- Pain Split  
- Teleport / Imprison / Knock Off / Thunder Wave / Trick Room

Deoxys-S

Deoxys-S is the fastest non-Prankster Taunt user in the entire meta, gaining a niche from that alone. But Deoxys-S is so much more. It is also the fastest Stealth Rock setter and the fastest non-Prankster user of many other moves, such as Trick, Imprison, Pain Split, and Knock Off. Deoxys-S has a variety of other moves up its sleeve such as Teleport, Thunder Wave, and Trick Room. Deoxys-S needs to be Naive or hold Black Sludge in order to be guaranteed OHKOed by Gholdengo Steel Beam, but depending on the set, it may end up preferring a Hasty (take Knock Off and Struggle worse) or Timid (hit more weakly with Knock Off) nature instead. Deoxys-S's Pain Split is at its most effective when its HP is maxed out, to the point that Gholdengo Steel Beam can no longer OHKO it from full. Deoxys-S can have 1 HP IV if Tricking Sitrus Berry (to have an odd max. HP and reduce the odds that it consumes its own Sitrus Berry) or 6 HP IVs if being a Stealth Rock setter on a Court Change team (to make its max. HP divisible by 8). Deoxys-S needs 3 perfect IVs, so distribute them well (always put perfect IVs in Speed and the unused Special Attack, place the 3rd perfect IV in an unused stat if possible). Deoxys-S generally prefers Tera Dark to dodge Pranksters, but Stealth Rock setters should be Tera Ice to become weak to Stealth Rock and Steel Beam.

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