Pretty sure you meant Conkeldurr lol.counter allows metagross to do more damage than it normally would to its offensive checks, such as metagross, gallade, jolly talonflame, av azu, and (mega)scizor.
Anyways, here we go!
Stallbreaker Conkeldurr
Conkeldurr @ Leftovers
Ability: Guts
EVs: 8 HP / 252 Atk / 228 SpD / 20 Spe
Adamant Nature
- Drain Punch
- Knock Off
- Taunt
- Toxic
This set is used to lure in and cripple mons that are mostly found on stall teams with a combination of Knock Off (to get rid of Leftovers, Eviolite and other annoying items), Taunt (to deny their access to recovery, status inducing moves, entry hazards, etc.) and Toxic (to status common switch-ins like physical walls and such). Drain Punch is essential for Conkeldurr's last move as a mean to stay as healthy as possible throughout the match and is helpful to drain away a mon's health while it can't use recovery moves and such. Leftovers is chosen for the itemslot for more longetivity.
At first, I thought of using Fling + Toxic Orb to cripple Mega Sableye (a mon it couldn't touch before), but since Toxic Orb diminishes Conkeldurr's lifespan and Fling works only once, it's a generally lesser option. Now, it still can't do anything to Mega Sableye, but it can cripple many would-be checks/counters such as Landorus-T, [Mega] Slowbro (unless it's CroBro, but then again, Conkeldurr has Taunt), Hippowdon, Mandibuzz, Alomomola and others.
The given EV spread maximizes Conk's Atk stat, enables it to outspeed and Taunt/poison Hippowdon, gives it a Leftovers number and makes it tank special hits better (though I'm not quite sure it's the optimal spread for its stallbreaking purposes).
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