Leech seed or stealth rock on Ferrothorn?

I need help on deciding which Ferrothorn build is better in competitive play, this will be the first Pokemon I EV train and such, so I’m uncertain of what works, and what doesn’t.

I was planning on having both leech seed and stealth rock on my Ferrothorn, but I was told that in the 5th generation it isn’t possible, so instead I have two potential builds around either move-

Leech seed FerrothornFerrothorn @ Rocky HelmetTrait: IronbarbsEv’s: 252 Hp, 128 Defense, 128 S.DefenseNature: Relaxed (+Def, - Spe)

Leech seed- in lieu of leftovers, he can receive healing and instead hold the rocky helmet for physical hitsToxic- Poisons the targetProtect- Free leech seed and toxic ticksGyro ball- I’m under the impression that you’re wasting the low speed of this Pokemon without this stab

Stealth rock FerrothornFerrothorn @ LeftoversTrait: IronbarbsEv’s: 252 Hp, 252 Defense, 4 AttackNature: Brave (+Atk, -Spe)

Stealth rock- Important because it’s an entry hazard and may discourage your opponent from switching in fire typesPower whip- Stab and hits hardGyro ball- Boosted by the nature, stab, etc.Curse- Stat increase, lowers speed, subsequently helping gyro ball and power whip

Honest feedback please, let me know if these are bad or any way to improve these-Thank you

Pleaselog inorregisterto add a comment.

Well, why not both?

Ferrothorn @ Rocky Helmet

Trait: Iron Barbs

EVs: 252 HP / 4 Atk / 252 Def

Relaxed Nature

This is one of Ferro’s most effective sets.