Murkrows primary goal is to thunder wave sweepers like zacian and koraidon, effectively removing them from play. It is immune to all hazards except stealth rock, letting it preserve sash and not be slowed by sticky web, which makes it a great hazard clearer. Haze lets it override win conditions like xerneas and ultra necrozma. It will always outspeed groudon, and while the exact damage varies on set, foul play is usually a3-4HKO. Acssuming sash is intact, this lets it consistently do over half P-groudons HP, putting it into range to be revenge killed by a sweeper of choice, while preserving more valuable game pieces. To cover its matchups (S+ to B-):
-Primal Groudon: Can switch into precipice blades and do over half its health as previously stated+
-Koraidon: Can thunder wave it, making it effectively useless+
-Arceus Ground: Can haze if it tries to calm mind, otherwise useless unless they run a physical set for some reason-
-Dusk-Mane-Necrozma: Foul play hits it decently hard and it will always outspeed+
-Ho-oh: If its offensive, foul play will annoy it, otherwise it can still paralyze it, but ho-oh probably won't notice-
-Eternatus: Can paralyze it, which eternatus cares a moderate amount about+
-Zygarde-C: Can get rid of its buffs+
-Xerneas: Obviously hates haze+
-Zacian-C: Can paralyze it, which unlike koraidon, does not make it useless because it has bulk, but still significantly decreases its usefulness+
-Arceus Dark: See Arceus Ground-
-Mega Salamence: Can paralyze it and get rid of its buffs if it d dances, or use foul play to hit it back for hefty damage+
-Arceus Fairy: Can paralyze it and remove its buffs, which is basically just a mild inconvenience to it-
-Arceus: Assuming it isn't running cosmic power, can paralyze it, remove its buffs, foul play for big damage, and tera to avoid extreme speed (but why would you tera your murkrow?)+
-Primal Kyogre: Paralyze, haze its calm mind buffs, foul play because it has a high attack stat even if it doesn't use it.=
-Arceus Water: See arceus-fairy, although its foul play does more damage-
-Giratina Origin: Paralyze, foul play, shadow sneak is annoying but it resists it+
-Yveltal: Pain- - - - -
-Ultra Necrozma: Haze removes buffs, t-wave cripples it, it's weak to foul play, great matchup+
-Mega Mewtwo Y: Paralyze, super effective foul play against a decent attack stat+
-Deoxys Speed: Paralyze, foul play, defog to counter hazards, oh crap it used magic coat=
-Marshadow: Haze, foul play, thunder wave, you know the drill, watch out for shadow sneak+
-Deoxys Attack: Mega mewtwo y but it may be physical+
-Arceus Ghost: Take normal arceus, give it a weakness to foul play, and youve got a free kill+
-Ferrothorn: Why are you using murkrow against ferrothorn-
-Flutter mane: Paralyze it, haze if it did calm mind+
-Grimsnarl: While murkrow cant do anything to grimsnarl, the opposite may also be true if it didn't bring an attack. So you can switch into grimsnarls parting shot and block its switch. Then, because it now has no choice but to switch out manually, defog and get rid of its screens.=
-Lunala: Quad weak to foul play, can be paralyzed, good matchup if you've dealt with shadow shield+
-Palkia Origin: Paralyze it=
-Rayquaza: Same procedure as normal arceus+
-Calyrex Ice: Foul play, haze, or thunder wave depending on which would be more appropriate for the situation+
-Pheromosa: Once its speed is halved, it is useless. Triple axel will probably break your sash, but trading a murkrow for a pheromosa is great.+
-Smeargle: Para or haze. Alternatively, switch in murkrow on spore so sleep is wasted on it.=
-Zekrom: Foul play or haze+
Arceus Flying, Poison, Steel: What do these guys even do. I think I've seen two arceus poison and one arceus steel in my entire time playing ubers.
-Dialga: Thunder wave=
-Ditto: As neutral of a matchup as it gets. But this means that the foe can safely break your sash.-
-Giratina: Foul play+
-Magearna: Thunder wave, haze+
-Mega Diancie: Pain- - - - - - -
-Mega Mewtwo X: Standard procedure+
Positive matchups:24, Negative matchups:8, Neutral Matchups:6, Unknown:3
Overall, murkrow provides fantastic utility, solving a lot of problems in a concise way, while having great matchups against many of ubers biggest threats. While niche, I believe its contributions are enough to earn it a place in ubers.