More obvious ones are things like Iron Tail Primeape (Mankey has a tail so can learn the move) and Aerial Ace going to a huge amount of Pokemon. Hariyama learning Brine is a really interesting take on Sumo as well. Salt is a huge part of proper ceremonial Sumo wrestling, and getting Brine into the moveset is a nice nod to that.
Just a reminder about Aerial Ace, its Japanese name, Swallow Return, is referencing a
sword technique. Though many bird Pokemon learn it for the pun, its why Pokemon who scratch/cut/slash are able to learn it as well.
The mental image this inspires reminds me, according to Bulbapedia, Emboar looks like it's wearing a wrestling singlet, so ... maybe it's spitting out the water it drinks in between rounds? That'd actually be such a cool touch on its design.
I JUST MADE A DISCOVERY! Emboar probably shoots Scald out of its mouth, right? Well one could say that Emboar, a pig, would be spitting. Get it? Pig on a spit!
Gastly and Wooper can learn Punching moves while Kyurem-Black isn't able to learn Ice Punch.
Maybe Wooper uses its gills like fist? Though Kyurem-Black should be allowed to learn Ice Punch... just like Emboar should be allowed to learn Fire Punch naturally.
Paras and Parasect can learn Sunny Day. Which boosts fire attacks. And they both get Dry Skin as an ability..
Similarly, Slugma can learn Harden, even though its Pokedex entry says it's body hardening is possibly the worst thing that can happen to it.
Everything with a gender gets Attract because that's how it works. Besides, there's probably somebody out there that likes that look. The real question is why does Cyrogonal get it and Ferroseed, Ferrothorn, Nincada, Larvesta, and Volcarona don't?
Because Cryogonal is a special snowflake, Ferroseed family are mostly immobile nut covered in steel that its a miracle it can reproduce in the first place, and for many bug species the last thing they want to do is reproduce because, well, it would be the last thing they'll do. Of course these are exceptions to the rule, all other genderless Pokemon don't learn attract (Mew only gets it on a technicality), there are many plant Pokemon that don't move a lot that get attract and Bug-types that get Attract. Honestly many of these are either oversight or just the decision maker not thinking the Pokemon would ever use the move.
Sort of reminds me how Regigigas doesn't get Rest. Most every other Pokemon gets it but not Regigigas despite you finding it while its asleep and possibly wake it up (though maybe that's why it doesn't need to? Then again there are other Pokemon who slept just as long or longer and they still get Rest).
I just remembered that Larvesta and Volcarona get Magnet Rise as an egg move. Um, what?
Yeah, that sounds like the creators trying to give a winged Pokemon the immunity to Ground that they deserve (though that doesn't explain how Larvesta gets it). Always thought they should have a Magnet Rise clone for winged Pokemon, they could call it something like Flutter.