Gen 9 NU Stealth Rock
Registeel @ Leftovers
Ability: Clear Body
Tera Type: Dragon / Water
EVs: 252 HP / 4 Atk / 252 SpD
Careful Nature
- Stealth Rock
- Heavy Slam
- Earthquake / Body Press
- Thunder Wave / Iron Defense
A Stealth Rock set Registeel can use in NU. Registeel's bulk allows it to be a really good Steel-type in NU, most likely being the best Steel-type in NU despite it being passive. Quite a shame Registeel lost its best sources of dealing damage with Toxic and Seismic Toss. Despite the huge losses, Registeel does what it does quite effectively in NU.
Stealth Rock lets Registeel setup a hazard that chips opposing Pokemon switching in. Heavy Slam is used for the Steel STAB since it is useful to hit opposing Pokemon such as Diancie, Brute Bonnet, and Tsareena harder than Iron Head. Earthquake is used primarily to deal super effective damage to Chandelure to prevent it from coming in for free. Thunder Wave allows Registeel to spread paralysis to cripple fast Pokemon switching in. Iron Defense and Body Press can be used instead of Thunder Wave and Earthquake to let Registeel serve as a potential wincon and make it not as passive. Tera Dragon as well as Tera Water allow Registeel to give Registeel a defensive typing that lets it resist Fire moves. Tera Dragon lets Registeel keep its resist to Grass and gives it other useful resists to resist Electric and Water moves. Tera Water lets Registeel resist Water moves while not being weak to Ice moves, which is useful against Inteleon.