I'd recommend trying U-turn over Flash Cannon on Hydreigon. Momentum is better than 40% on clef when it just soft boils on you as you're forced out or doing jack all to Fini. Hydreigon has some pretty telegraphed switchins so getting in a teammate to handle puts you in a better position.I'd like to share some fun sets that I've been using lately. I've been enjoying OU a fair bit more lately than I used to. It's been an absolute blast to play OU lately actually -
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Nincada @ Eviolite
Ability: Compound Eyes
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Toxic
- Mud-Slap
- Skitter Smack
- Protect
252 Atk Landorus-Therian Earthquake vs. 252 HP / 252+ Def Eviolite Nincada: 46-54 (17.2 - 20.3%) -- possible 5HKO
252 Atk Landorus-Therian Stone Edge vs. 252 HP / 252+ Def Eviolite Nincada: 62-73 (23.3 - 27.4%) -- 64.8% chance to 4HKO
Don't you judge me, you wish you could yeet Landorus-T this good. On god, I was absolutely fried earlier and ended up using this bad boy and he actually ruled. Never underestimate just how much you can piss people off with a hyper-physically bulky Toxic LC wall in OU that also slaps Mud-Slap.
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Hydreigon @ Choice Scarf
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Dark Pulse
- Flamethrower
- Flash Cannon
I have been having an absolute blast with this spooky boi. You'd be surprised how many people will just leave their Dragapult in on this guy expecting to outspeed and OHKO. Draco Meteor and Dark Pulse are fantastic in the current meta, Flamethrower and Flash Cannon are superb coverage for him as well. In addition, having an Earthquake immunity is always a plus.
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Grimmsnarl (M) @ Toxic Orb
Ability: Prankster
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Trick
- Spirit Break
- Sucker Punch
- Power Whip
Want something that will almost assure that you cripple at least two of your opponent's Pokemon if you play the prediction game right? Grimmsnarl is ya boi. Prankster Trick is incredible, Spirit Break is a fantastic STAB move that assures lowered Special Attack, Sucker Punch is fantastic STAB Priority, and Power Whip is to obliterate Swampert, Tapu Fini, the Slowtwins, and Tyranitar.
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Heatran @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 4 SpA / 252 SpD
Calm Nature
IVs: 0 Atk
- Magma Storm
- Stealth Rock
- Earth Power
- Protect
I know forgoing Toxic can be blah sometimes (never fear, Nincada will pick up the slack), but I've found that replacing it with Earth Power has actually been really helpful in some additional surprise utility against opposing Heatran and specific switch-ins. The rest is pretty typical bulky rocks magma tran.
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Melmetal @ Assault Vest
Ability: Iron Fist
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Double Iron Bash
- Ice Punch
- Thunder Punch
- Darkest Lariat
This thing never dies. Seriously, look at them thighs, puttin' TikTok to shame with those moon glutes. Just throw this thing in front of whatever thing you need bonked, and it'll get the damn bonk. Physical BoltBeam coverage, Darkest Lariat, and STAB Double Iron Bash, nothing escapes this thing other than Heatran.
On Heatran I'd consider Taunt > Protect to be able to trap pex that have had their shed shells knocked off, and because one of heatrans more common switchins is Urshifu-R, which bypasses Protect anyways. You also shut down passive mons giving you free turns
And for melmetal, put the HP EVs into SpDef. You'll start taking 0 damage from special attacks, and melmetals HP stat is insanely high to begin with