Crawdaunt vs ALL the threat in the Viability ranking (well, not all because too big, but at least what I can)
List
Chansey: True, Seismic Toss doesn't do enough and is completely crippled by Knock Off.
Hawlucha: KO vs KO. Hawlucha wins because it's faster.
Mega Houndoom Here it's great. None of Mega Houndoom attacks can OHKoO (unless Solar Beam, but has to set up the Sun manually). Luckily HP Fighting doesn't OHKO (goos to show the 60BP effect)
Hydreigon: OHKO by Focus blast or Draco Meteor. Only SuperPower can OHKO Hydreigon.
Magnezone: Has a chance of survive Super Power, but other attacks can 2HKO But Magnezone OHKoes it easily.
Slowbro: Normally a good switch in because all these moves are non effective against him.
Suicune: Depends of the Calm Mind and the ability of Rest/Sleep Tak Normally Crawdaunt wins.
Mega Blastoise: Ouch. Aura Sphere (a common move) makes him out. In orange, because Crawdaunt usually outspeed.
Chandelure The standard set is the Scarf Set. Normally loses against Energy Ball but Crawdaunt OHko with either of the STAB.
Chesnaught: A counter of him co peltely. Even Aerial Ace is not enough. Any of the attacks is a clear OHKO.
Crawdaunt. Mirror Match
Darmanitan Great becausxe Aqua jet OHKO but none of Darmanitan attacks doesn't.
Florges Double OHko between each other. Wins if Specially Defensive with Crabhammer. Loses if Physically Defensive.
Haxorus Given the low number of Steels and Fairies it could have a way to abuse Outrage if it does, it wins. if not, Knock off ill KO.
Mew For some it's a counter. For other sets is a check
Mienshao Mienshao wins the OHKO battle because it's way faster. Aqua Jet 2HKO. Depends of the situation, neither can't switch in.
Victini Normally wins with either of the STABs, but it can be OHKoed by Bolt Strike/Thunderbolt.
Zapdos The offensive set is OHKoed by Thunderbolt easily. But Crabhammer and Knock off OHKoes i. It's obviously faster.
Celebi Wins with Energy Ball/Giga Drain 8either of the two). But can OHKO with Knock Off.
Crobat Wins against utility sets. If it's a more offensive set, not that sure.
Heracross Wins with Megahorn and Clsoe COmbat even though it OHKoes with Crabhammer.
Hippowdon Earthquake doesn't KO. Crabhammer can OHKO. It has to deal with Sandstorm. Is not a counter but a possible check.
Jirachi if there were the pohysical set, the move with more danger is U-turn But given how it can run a special set, and is faster, uf, uf. OHKO by Knock Off.
Keldeo Faster, and OHKo with Secret Sword. If they have Focus Blast (only needs 2 moveset) it could be ridiculous. It's faster and we are dealing with the CS set.
Latias Dragon Oulse 2HKo. But given that in UU there's no Latios competence, normally uses Draco Meteor (offensive). Knock off clearly OHKOes as expected.
Mega Manectric It has to be lucky with Crabhammer. Harsh, harsh because either STAB OHKOes
Nidoking Good because Aqua jet can OHKO easily. But wither of the three of the most usual moves of Nidoking also OHKoes.
Reuniclus Good because Knock Off but Focus Blast also OHKoes easily. I put this color because it's slower.
Roserade Normally loses but Knock Off hurts and OHKO.
Shaymin Knock Off deals great damage (it OHKoes qith Aqua jet). It changes with Crunch. A good check with Seed Flare
Tornadus-T Normally wins but Hurricane usually OHKoes with ife Orb. Air Slash can OHKO except a small chance with leftovers/Assault Vest. However, STAB from Crawdaunt OHKOes.
Umbreon A great check, evena counter because it's slower.
Zygarde 50/50 literally. Considering Zygarde is faster, Knock off `Aqua jet can OHKo and Outrage has to be +1 to OHKO.
Mega Absol Play Rough can OHKo If not, Sucker Punch. But has paper defenses (Crabhamemr OHKOes)
Mega Aggron A great check, almost a counter But not a counter because Earthquake doesn'0t OHKO and can't switch easily.
Azelf Thunderbolt or not Thunderbolt. Depending of it, the result are different. Knock Off OHKOes regardless.
Empoleon Almost great if there's the common set. However, exist the risk of the offensive set, which means I put it on blue
Entei Sacred Fire is too mcuh, even though crabhammer OHKOes Depends of hax.
Krookodile Easy set up given ho0w Aqua jet does to him. Neither of the attacks OHKO Crawdaunt.
Kyurem Normally it loses but Knock off means it can't counter it.
Machamp. Literally the 50% of chance of OHKO with Crabhammer. obviously Dynamicpunch OHKO.
Metagross Thanks for resisting Meteor Mash and the Steel nerf.
Nidoqueen Given how Crawdaunt is faster, which means iffy-iffy.
Toxicroak Drain punch is too bad Not a counter thanks to Knock off. If Crunch, it could be red. AndCrabhammer means heal with Dry Skin.
Mega Aerodactyl Normally it wins aginst Aerodactyl easily.
Arcanine Intimidate and Close Combat means it has to click Crbahammer to OHKO.
Mega Ampharos A excellent check. Either oft three common moves OHKO Crawdaunt.
Bronzong Normaly it's Specially Defensive meanign Knock off is a clear OHKO. very low damage rolls means a safely good threat for Crawdaunt.
Cobalion The standard is Full offensive (even Jolly). Not a counter because Super Power. CC (or even Sacred Sword) OHKOes.
Doublade Gyro Ball is too slow that is too much. 50/50.
Drapion A great threat for Crawdaunt given netiher of OHKO.
Durant OHKo vs OHKO. Durant wins in this case because it's way faster.
Escavalier Megahorn OHKoes. but not a counter because 85% and huge damage from STAB.
Froslass A safe threat of Crawdaunt Unless Thunderbolt or Destiny Bond.
Heliolisk Knock off OHKOes but the standard ability is Dry Skin, meaning that the possibiity of pickignWarter moves is easy. Guess what Volt Switch and Thunderbolt does.
Honchkrow Paper defenses means the usual thing. But given how easy is to OHKO it can win easily.
Mismagius Thunderbolts OHKoes even with leftovers. knock Off clearly OHKOes.
Noivern It's a revenge killer and done a great good at what it does. Knock Off OHKoes as expected.
Raikou Same with Noivern with the OHKO in Crabhammer.
Rotom-H Crawdaunt wins with Crabhammer but Volt Switch.
Shuckle OHKo with Cradaunt A great aly but an easy pick for Crawdaunt.
Snorlax Iffy, iffy. Depends of the set used by Snorlax.
Tangrowth Almost a counter. Given thow Knock Off works, it's considered a counter.
Vaporeon Normally a safe threat. Knock off 2HKO. In blue because a more offensive set.
Vivillon Normally it loses because 97,5% Sllep powder and survives Aua Jet (ony one).
In other words:
Green (Safe switching in): 5 pokemon of the entire list has to switch out an dcause Crawdaunt to have a feee turn.
Blue (Normally wins): The listed is amplied to 16 pokemon that can threan by this pokemon by being walls, hav ing NVE moves or beign slower.
Yellow: Meams 50/50. Normally the situations depends mainly of small details (SR on/off, hax,etc) to deicde the outcome. 1q5 pokemon in.
In Orange, the most large list. This is allt he pokemon that can deal with Crawdaunt 1vs1. Generally many can'pt usually sitch in to all this moves (some can do to some of it, making it checks).
And in red, the counters of Crawdaunt.
Basically, Crawdaunt is like Rampardos, more or less. With two qualities that Rampardos dreams; priority and unresisted STAB.