Now for a positive example. Dragon Dance is another move with some interesting distribution--and after looking at it, I'm very impressed with how thought out it is.
The mons that learn it by level-up are all Dragons or soon-to-be Dragons (Horsea and Seadra). The only other significant distribution method is via breeding. Let's look at the non-Dragons that get it:
Charmander. Well, Charizard is the dragon that wasn't a Dragon, so that makes sense.
Lapras. We're talking Nessie here, so that also fits thematically.
Todotile. Fearligatr is, well, an alligator, which is a bit of a stretch, but we'll go with it. (Side note: how does the Big Jaw Pokemon not have Strong Jaw for an ability?)
Larvitar. Tyranitar is pretty much Godzilla. That works.
Barboach. Whiscash is a namazu, a giant catfish who causes earthquakes. (Cash's actual size: two feet, eleven inches.) Works for me.
Corphish. Crawdaunt is a lobster. I'm trying to imagine a lobster dancing like a dragon, whatever that entails. I definitely wonder about this, but the mental image is quite funny.
Tropius. It's a sauropod, a type of dinosaur, so it works.
Scraggy. Get down, young Hoodlum, get down! I wonder how you get from hip-hop culture to dancing like a dragon.
To sum up, DD actually has a very neat distribution. Though again, one wonders how Crawdaunt and Scrafty get it--but I daresay that if you're the type to use those particular mons, you may not care very much.