Don't know why but I get such a disproportionately huge kick out of going behind the meaning of a move, or the origin of a Pokemon concept - and finding something that got lost in translation but that makes the move fit once you know it. So satisfying haha.
For a long time I didn't understand why Lucario got Bone Rush, and in fact it kind of annoyed me that it was allowed to intrude on one of the Cubone family's signature moves. Like the ultimate fanboy Pokemon needed more gimmicks. But then I thought about its concept originating with Anubis, the Egyptian god of the dead with the head of a canine, and suddenly it seemed like a much more comfortable fit.
Slightly different vein, but I'm using a Stufful in-game at the moment that recently evolved into Bewear, and it learned Bind upon evolution, which seemed very out of place, what with the lack of tentacles, vines, coils etc. But yeah then you think about Bewear's concept as the 'killer hug', and in terms of available Pokemon moves to capture that idea of a spine-snapping fatal embrace, Bind seems like as good an option as any.
Maybe Guillotine? :/
No, Guillotine is cutting, not crushing like what Bewear does. There is no OHKO moves that involve crushing the opponent into unconsciousness, which is a bit odd. We have cutting in half, drilling through, dropping down a crevice, and freezing; but no crushing. Actually we don't have a lot of what you'd think would be a OHKO move: crushing, suffocating, quick-acting lethal poison, incinerating (seriously, no Fire-type OHKO but Ice gets one?), drowning, electrocution; we could even go to things like pressure points, soul snuffing, and mind crushing. You could probably come up with a OHKO for each type, though then again that's probably why they don't. All OHKO moves but Sheer Cold have a type that's immune to it, and Ice probably got one probably as a form of compensation for having a status ailment that has a low chance of happening ("Should we improve the Freeze mechanic and make it more common?" "Nah, how about we give them a OHKO move instead, they already have a status ailment with a low chance of happening so what's another gonna hurt?").
Besides Bewear has plenty of crushing moves it has at its disposal... it doesn't learn Crush Claw? Wait, okay, apparently Crush Claw is called "Break Claw" in Japan and is more about slashing the opponent. Only "crushing" move is Crush Grip which is the Signature Move of Regigigas... but you know what, why not also give it to Bewear? Plenty of Signature Moves, including ones of Legendary Pokemon, have gone to other Pokemon in later generations and this one makes perfect sense.
Actually Bewear is missing a few moves I'd think it would have now looking at its movepool: Block, Defense Curl, Endure, Play Nice, Tearful Look, & Submission.