you look at the future paradoxes and the only ones who learn Electric Terrain at level 1 instead of the move reminder are Iron Treads, Miraidon, and Iron Jugulis for some reason.
Maybe Iron Jugulis getting it is a reference to King Ghidorah?
(I also remember seing somewhere that Sucker Punch is "sneak attack" or something similar in japanese but google translate doesn't seem to agree)
I think it's closer to surprise attack than sneak attack but yeah. Hence why people like Geodude and Diglett could get it as tutor moves.
And why it's not considered a "Punch" Move (and thus isn't powered-up by Iron Fist).
Also, Deoxy-S, Togekiss, and Zygarde are never mentioned to be tied to some sacred belief.
Deoxys descended from the stars.
Togekiss is a peace keeper bringing joy to all those good-hearted.
Zygarde is a guardian of nature which keeps the power of life & death in-balance.
They may not have a specified sacred belief directly connected to them in the game, but they have deity-like traits.
... And then we have Zigzagoon (& Linoone, though only the Normal variant). I can't help but feel that is a Tanuki thing.
I'm confused as to how Dusknoir can kick without any legs to kick with.
Uses its wisp "tail" as a makeshift foot?
Shadow Claw was described as a "sharp claw made from shadows" since its introduction. All its learners, among them Charizard (no joke, it used to be a level-up move!), do have claws or hands or other visible sharp appendages (or are the Diglett line, who can learn a whole bunch of slicing moves, most infamously Aerial Ace).
Also the animation in every game looks like clawing.
Gallade, the Honedge line, and Ceruledge are getting Shadow Claw because it's the designated Ghost-type cutting move. Am I mad it's not boosted by Sharpness? Yes, and the same is true for Stone Edge and even Precipice Blades.
As how I see it, these Moves all have an intended methods of being used, but Pokemon have learned ways to use these Moves without having the right body parts by adapting them to what they have.
Normally to use a "Claw" Move (Shadow Claw, Dragon Claw, Metal Claw, Crush Claw, Dire Claw, Scratch) you would need to have elongated nails which end in a sharp point. The intended execution of these moves is to swipe at the target claw points first, pierce those points into the target, and then continue the motion of the strike pulling along the tips to create a bigger wound. The elongated part of the claw is to provide a natural sturdy "handle" which isn't likely to break and let the user more easily guide the attack. In this way you can see claws more as mini glaives or halberds.
Moves powered-up for Sharpness as ones where the user has or created an energy/elemental blade. A blade is sharp all throughout its perimeter. It has given up a sturdy handle so that no matter where it strikes it'll cause a deep wound which could open wider sliding the remainder of the blade parallel to the wound.
Both are about piercing into the target and creating a wider wound, but the difference is claws rip and blades slice. Because of this, a "Claw" Move only needs a point to be sharp enough to puncture, whereas the entire "blade"'s edge needs to be sharp. A dull point will still do its job but just require more effort, meanwhile a dull blade is more or less useless as what it's intended to do. A Pokemon with sharp claws can use "slicing" Moves by imitating the slicing movement or creating energy/elemental claws which act more like blades. A Pokemon with blades can use "claw" Moves by adjusting their blade use so that they more focused on the point of the blade.
Hence the Ability Sharpness only affecting "slicing" moves. The Pokemon which have Sharpness all have blades of some kind and the Ability makes it so their blade's perimeter is even more razor thin for "cleaner" (aka deeper piercing) cuts. Such a adaptation is useless with the "Claw" Moves as they only ever need the point to be sharp (and they also don't want the point to be too sharp as it might not cause the ripping effect).
Note though I am completely talking out of my behind here. Because I too agree that the Claw Moves should also be powered-up by Sharpness, there's no reason to be so strict thinking about this. Though, aside from some coverage Moves missing out, so far this isn't a big deal as all Pokemon who get Sharpness has a STAB Move which can take advantage of the power boost. Which is better than Iron Fist and Strong Jaw which have several Pokemon wishing for a STAB Move would be made so they can too take full advantage of their Ability.
You ever think about how Drowzee and Hypno can't learn Dream Eater by level up in any games besides Let's Go Pikachu & Eevee. Sure, they can still usually learn it by other methods, but you'd expect them to be able to get it by level up, considering how, y'know, eating dreams is a huge part of their whole idea.
When Drowzee and Hypno snack on dreams for nourishment, they likely do so slowly and only bit-by-bit as not to cause harm to their "host". As odd as it may sound, Dream Eater goes very much against their natural eating habit that it has to be taught via an outside method instead of it knowing it naturally. Dream Eater causes damage and is a big gulp of energy which is used for immediate healing rather than nourishing. Doing so doesn't satisfy the Drowzee family's appetite and may cause their host to wake up thus they just lost their meal ticket. Their natural slow & bit-by-bit feeding causes no harm letting their host keep on sleeping as the Drowzee family feed continually until they get their fill. This is why Drowzee & Hypno are used for sleep therapy.
So why is LGPE the sole exception despite the Drowzee family being available in BDSP and SV (and Dream Eater being a TM in LGPE & BDSP but not SV, so the only way to get a Dream Eater Hypno in SV is trading it up)? Well let's remember LGPE excluded a lot of Moves which caused them to have to fill in gaps in movepools. Notably for the Drowzee family they lost Future Sight, and while not a big loss was still a missing "later level powerful Psychic Move" which they decided to fill with Dream Eater. Why didn't it keep it? My theory: BDSP. It reset their Movepool to pre-LGPE thus losing Dream Eater and getting back Future Sight. But no biggie, Dream Eater was still a TM... until SV (though maybe Indigo Disk will bring it back).
Honestly if GF doesn't consider Dream Eater "proper" for the Drowzee family maybe they should pull an Annihilape and give it a new evolution & new Signature Move and/or Ability which more meshes with its lore (maybe an Ability which heals it a bit every turn there's a sleeping Pokemon (but doesn't damage the sleeping Pokemon) on the field and if it uses Hypnosis its Accuracy increases to 90%).
Kabuto and Kabutops learn Absorb by level up in Gen I, but conspicuously fail to learn Mega Drain by TM. This was corrected in later gens, not that it matters because by then the far better Giga Drain was a thing.
Them getting Absorb is a weird thing already. Like, if that's part of their biology, give it a STAB version of Giga Drain.
"I can assure there's a good reason the Poison Gas learns Dream Eater while the Dream Eater learns Poison Gas."
"Uh huh, sure, in the meantime you're sleeping on the couch until you see a gastroenterologist".