I thought on 2 great sets for the Iron Snake Pokémon
Gen VIII
Steelix @ Life Orb
Ability: Rock Head
EVs: 4 Def / 252 Atk / 252 SpD
Adamant Nature
- Curse
- Gyro Ball
- Earthquake
- Head Smash
This thing getting both Curse and Gyro Ball is INCREDIBLE: the first lowers your already bad speed, and raises Attack and Defense; the second is a STAB Steel move that does more damage depending on how slow you are compared to the target.
EQ is its Ground STAB move, powerful, but risky in double battles
Head Smash has INSANE power and there is no recoil thanks to Rock Head
Now the second
Gen VIII
Steelix @ Life Orb
Ability: Sheer Force / Sturdy
EVs: 4 Def / 252 Atk / 252 SpD
Adamant Nature
- Curse
- Gyro Ball / Iron Tail
- Earthquake
- Payback
Payback also pairs really well with Curse, since it does more damage if it was hit that turn
The Steel move depends on the chosen Ability: Gyro Ball with Sturdy, Iron Tail with Sheer Force.