Lairon is a pathetic pokemon that should never be used because it is outclassed at everything it can do.
Lairon @ Eviolite
Adamant Nature
can't remember the EVs, 252atk/252 spe iirc
- Automize
- Roar
- Head Smash
- Earthquake
This is Outclassed by Relicanth. Not only Relicanth is as strong and bulkier(if not using eviolite for actual power), it is also faster(this is important for rock Polish sets), and has superior coverage that it will actually use(try to find something that resists water+rock+normal). Also, lol, is this supposed to be a joke?, because Roar on something that lacks power and is meant to be offensive is simply terrible. The only thing Lairon can beat that Relicanth can't before a speed boost is Cinccino, but even then, Cinccino would simply u-turn out to one of the many that can beat Lairon without even trying anyway.
Edit: Forgot something, Relicanth is also light as fuck if you are really worry about random Low Kick/Grass Knot.
Lairon really doesn't need to be trying Autotomize / Rock Polish sets; without Hone Claws boosts it doesn't hit quite as hard or as accurately as it needs to. The +2 to Speed only gets Adamant sets to 358, which I think is a poor trade for the ability to consistently hit with a boosted Head Smash.
Give me a legitimate reason for not using Armaldo for attack boosting rock-type . Armaldo hits way harder at +2 with Stone edge than Lairon with a +1 head smash, has superior special bulk to take waker hits and set up easier, and it is even slightly faster. And IB4 BUT LAIRON HAS ACTUAL RESISTS!, Klang is better for the setting up part because it will set up on the same things that Lairon will, except that it will be faster than almost everything, break subs, and while it is true that Klang doesn't have a 150 bp STAB move, it is way harder to revenge because its boosting move makes it faster than everything without a scarf. And just in case, if I wannted to use something to nuke the opponent on trick room, I would use Rampardos or Marowak instead because they don't need to waste their time setting up when they hit really damn hard already.
I saved this one for last
Lairon @ Eviolite
Trait: Rock Head
EVs: 252 Def / 248 HP / 8 Spd
Impish Nature
- Head Smash
- Stealth Rock
- Roar
- Earthquake
I get roar is a cool move and all, but really, that is the only thing over the other good Stealth Rock users in the tier. Even Probopass(yes, you are reading this, Molk and Ebeast) is better because it has a sweet slow volt switch that is pretty helpful to get out of there, and if you really need it, some kind of recovery in Pain Split, allowing it to stay alive for longer.
TL;DR: Lairon is a piece of shit that should never be used and I'd use THE MIGHTY METANG over this piece of shit every single time.