Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 Spe
Bold Nature
IVs: 0 Atk
- Volt Switch
- Hydro Pump
- Pain Split
- Thunder Wave
Nidoking @ Life Orb
Ability: Sheer Force
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Earth Power
- Sludge Wave
- Ice Beam
- Flamethrower
Alrighty-right, I got me here a paralyzing washing machine and a poison armor dinosaur thing, ready to wreck any opposing teams! These two have really nice synergy. Grass types like Serperior or Tangrowth that smell a free switch-in against Rotom and get stopped cold by a T-Wave, allowing Rotom to Volt Switch out and keep up momentum. From there, Nidoking can outspeed and destroy said Grass-type with a Sludge Wave.
When a ground or water type switches in to revenge-kill Nidoking, Rotom can come back in and take the hit. Even though Ground types can't be paralyzed, they can be pressured by a Hydro Pump and forced out. Rotom checks priority-users like Azumarill and Talonflame, while Nidoking can handle common Rotom-W switch-ins like Clefable.
Rotom-W does miss Will-o-Wisp to check mons such as Scizor and Garchomp, but Nidoking can lure them on the switch by hiding the appropriate coverage move until a predicted switch, and then poof, they aren't a problem anymore.