A quick message to say that Corsola-G is actually a terrible pokemon.
This is a far better Conkeldurr check:
Hippowdon @ Rocky Helmet
Ability: Sand Stream
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Earthquake
- Slack Off
- Stealth Rock
- Whirlwind
252+ Atk Guts Conkeldurr Facade (140 BP) vs. 252 HP / 252+ Def Hippowdon: 170-201 (40.4 - 47.8%) -- guaranteed 3HKO
252+ Atk Guts Conkeldurr Drain Punch vs. 252 HP / 252+ Def Hippowdon: 136-162 (32.3 - 38.5%) -- 98.1% chance to 3HKO (18 - 21.4% recovered)
So with Sandstorm + burn recoil + Rocky Helmet damage, Conkeldurr has no recovery.
It needs Close Combat to beat Hippo:
252+ Atk Guts Conkeldurr Close Combat vs. 252 HP / 252+ Def Hippowdon: 219-258 (52.1 - 61.4%) -- guaranteed 2HKO
But if carrying Close Combat, it's not running Drain Punch, which means it has no recovery. And because of defense drops it becomes Dugtrio weak.
Hippo is also good at checking stuff like Bisharp, physical Aegislash, DD Tyranitar, Cinderace, Centiskorch, etc.
Sandstorm damage is also really appreciated on fat teams in a metagame where Toxic users are so rare.
So below is an improved version of the team posted:
Ditto @ Choice Scarf
Ability: Imposter
EVs: 252 HP / 4 Atk / 252 Def
Relaxed Nature
IVs: 0 Spe
- Transform
Dugtrio @ Focus Sash
Ability: Arena Trap
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
IVs: 21 HP
- Earthquake
- Reversal
- Substitute
- Screech
Corviknight @ Leftovers
Ability: Pressure
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Brave Bird
- Roost
- Defog
- U-turn
Sylveon @ Leftovers
Ability: Pixilate
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
- Hyper Voice
- Wish
- Protect
- Mystical Fire
Gastrodon @ Leftovers
Ability: Storm Drain
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Scald
- Earth Power
- Recover
- Clear Smog
Hippowdon @ Rocky Helmet
Ability: Sand Stream
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Earthquake
- Slack Off
- Stealth Rock
- Whirlwind
I also like to use this set instead of Sylveon:
Alcremie (F) @ Leftovers
Ability: Aroma Veil
EVs: 252 HP / 4 Def / 252 SpD
Calm Nature
IVs: 0 Atk
- Dazzling Gleam
- Recover
- Mystical Fire
- Aromatherapy
Because it gives Aromatherapy to the team, which helps considering Dragapult, Seismitoad, Toxapex all have burning moves (+Toxic).
Wish on Sylveon is also easy to play around, because you can use Stealth Rock or anything that presures the team (like SD Aegislash) the turn Sylveon is going to use Protect. Recover is better for this reason.
Aroma Veil is a good ability as it makes Alcremie immune to Disable and Taunt.
The downside of that option is that you can be PP stalled by Sub Hydreigon.
However, semi stall teams seem a lot more efficient this gen I have to say, stall just doesn't seem to have all the tools it needs to be consistent.
Hippo is so underrated this gen it's criminal. Whirlwind spam is still great, sand is still great, and this thing is bulky as hell. Most wallbreakers need setup nowadays and hippo laughs at them with its big windy mouth. I've been stalled out by this thing more times than I'd care to think about.