Metang @ Eviolite
Trait: Clear Body
Evs: 252 HP / 168 Atk / 88 Spe
Adamant Nature (+Atk - SAtk)
-
Hone Claws
-Meteor Mash / Zen Headbutt
-Bullet Punch
-Zen Headbutt / Earthquake
Setting up with Hone Claws instead of setting up SR. The idea of this is to set up and to cut a hole in your opponents team, or even to sweep endgame. Hone Claws is better for Metang than Swords Dance, especially considering Metang's STAB moves, which have both imperfect accuracy (85% and 90% respectively) as well as that Meteor Mash has a chance to boost Metang's attack even further. After a single Hone Claws, both Zen Headbutt and Meteor Mash have perfect accuracy, so they no longer miss at unconvienient times, as well as that they hit harder. If you get a free switch-in + set up, things are going down.
Meteor Mash is your main STAB move in most cases, but Zen Headbutt got a lot more useful with the drops and could act as a main STAB as well, since it hits Scolipede and Primeape for SE damage and you have Bullet Punch for Jynx anyway.
Bullet Punch is useful priority. Helps especially in dealing with Jynx as you can KO it before you are put to sleep / hit again, and helps dealing with Metang's significant speed issues.
Note, that both Zen Headbutt and Meteor Mash is an option, but with only STAB moves, you are completely walled by other Steels (though on a few you can freely boost up to +6 as they cannot do anything to you either, for example, Mawile).
Earthquake gives a lot of coverage together with Meteor Mash, hitting everything bar Air Balloon using Electric- and Fire types, Charizard and Emolga.
The EV spread might seem odd at first, but the Attack EV's are just sufficient when you run Zen Headbutt, and
168 Atk is the absolute minimum Metang has to run, if you take Primeape as a benchmark.
168+ Atk Metang Zen Headbutt vs. 0 HP / 4 Def Primeape: 276-326 (101.84 - 120.29%) --
guaranteed OHKO
Bullet Punch will always OHKO Jynx after SR with 168 EV's even without boosts, though Leftovers recovery throws a wrench in here (though only SubPlot really runs Leftovers, and you beat that anyway with Bullet Punch since you take next to nothing from Psychic and Ice Beam and it weakens itself through using Substitute).
You don't really have a problem switching in, proved by the following calcs:
248 SpA Jynx Ice Beam vs. 252 HP / 0 SpD Eviolite Metang: 57-68 (17.59 - 20.98%) -- possible
5HKO
248 SpA Jynx Focus Blast vs. 252 HP / 0 SpD Eviolite Metang: 96-114 (29.62 - 35.18%) -- 20.29% chance to
3HKO
This being said, as long as you run at least 168 Atk EV's, and max HP is obligatory for Metang, a variety of factors decide how much you actually want to dump in Speed, and as such, how much additional EV's you dump in Attack.
Sawk will never be OHKO'd by Zen Headbutt, even with max Atk, so those remaining EV's are put in speed so you get the jump on the slower things as well as a few other things up to Riolu (ending the phazing chain with Bullet Punch) when you opt to run
88 Spe EV's, allowing you to boost up further, or boost before they attack against those slower mons.
If you feel this number of Speed EV's is not necessary,
reducing it to 24 Speed EV's is an option, as this all but ensures Zen Headbutt and Bullet Punch combined KO Sawk as well as standard offensive Scolipede (though you should be setting up Hone Claws in Scolipede's face and THEN attack next turn). 24 Speed is enough to outrun many standard SR setters, which are all speedcreeped here, allowing you to put
232 EV's in Atk.
Another option is to forget Speed entirely and put 252 EV's into Atk and the remaining 4 EV's in SDef.
Note that Metang does not hit extremely hard even after one boost, and is still slow even with 88 Speed EV's, but Metang can set up multiple boosts on a few things because of its great bulk, which you can use to your advantage. Don't be too greedy though.