Been thinking about Gen 1 again in a way, and something came to mind.
I'm highlighting these two in particular, but there are probably a few other examples related to them that stick out.
But the topic I am highlighting is not really Farfetch'd and Lapras in terms of their battle capabilities, but rather certain Pokemon with respect to the concept of HMs as field moves.
HMs, as we all know, existed in the first six generations of Pokemon. They serve as field moves, cannot be erased from a Pokemon's moveset naturally, and are often gated in terms of being used as field moves by Gym Badges, the only region of the first six that didn't do so was Unova.
Gen 1 had five HM moves: Cut, Fly, Surf, Strength, and Flash. Back then, there was no Move Deleter, so when you taught an HM move to a Pokemon in the Gen 1 games, that move was effectively permanently etched into their moveset and could not be removed whatsoever.
Now why am I highlighting Lapras and Farfetch'd in particular? Because with the way they are implemented into Red and Green, one being an in-game trade and the other being a gift, they feel like they were explicitly designed to be
the respective users of Cut and Surf, respectively, from a viewpoint of their uses as field moves.
Farfetch'd is obtainable right around the point of the game that you would get the HM for Cut, and from there battle wise it's a good pre-promote option, but more importantly, its design and lore aesthetic describe it using its leek like a sword to cut things, and Cut as a field move is used for cutting trees. It definitely feels like Cut was absolutely intended to be taught to Farfetch'd and that players were expected to get a Farfetch'd at this point and use it as a Cut user on the field. This is further lampshaded in future games where GSC has the Cut masters use a Farfetch'd, and even in XY where in a Kanto shout-out they have an in-game trade for Farfetch'd around the time you would get Cut.
Lapras feels similar: it definitely feels tailor-made to be the definitive user of Surf as an HM. Lore wise and design wise it's a giant Loch Ness monster but it also ferries humans on its back to transport them across the water, which is what Surf does as a field move: enable travel across the water. And you ideally, assuming you follow RBY's intended game progression, should get Lapras shortly before you go into the fifth Gym in Fuschia City where you both get the Surf HM and unlock the ability to use it as a field move. Further lampshaded by GSC where Lapras is the overworld sprite for Surf, and XY also uses Lapras as a Kanto shout-out in that you get a Lapras as a gift around the point in the game where you get Surf, and also has Lapras with a special overworld sprite for Surf should you use one for surfing on the field.
In general, these two come off as explicitly designed to represent Cut and Surf as field moves, respectively. Given the way HMs were implemented in RGBY, it feels like the developers wanted players to use Farfetch'd and Lapras specifically for the Cut and Surf HMs.
And looking at the five HMs, HMs in Gen 1 do feel like they were designed around very specific Pokemon.
Cut: Farfetch'd, as I highlighted.
Fly: You don't get any special gift flying mon for this, but given Pidgey is the original "regional bird" that is caught early and is designed to be kept for the whole game, there was definitely an expectation that players would have a Pidgeotto by the time they get Fly, as an evolved form of the Pidgey they almost certainly caught in the first few routes: Pidgey is one of those mons that developers likely wanted every player to catch in some form or another. So in this case this move is probably associated with Pidgeot, who is more or less the textbook avian bird in the Gen 1 roster. Alternatively Doduo is in the nearby routes likely as a substitute for players who didn't get Pidgey.
Surf: Lapras, as I also highlighted.
Strength: This is the one HM move that as a field move I struggle to think of a Pokemon who was designed around it. The only Pokemon who feels tailor made for Strength lore wise is Machamp, given Machamp serves as the boulder pusher in SM as a Ride mon and Strength was its signature move back then, however, Machamp is a trade evolution that evolves from Machoke, although one could argue Machoke could work too. The Machop line is not available as a gift and is a wild encounter looong before you get Strength. Arguably the Hitmons as gifts just after the fifth badge and before the sixth could fit, though that's pushing it.
Flash: Mr. Mime feels like it was at least partially intended as an in-game Flash user. You get it around the time you get Flash as an HM in an in-game trade, this checks out.
Anyway, this is just a bit of mystery and conspiracy I look at, but HMs in particular do feel like they were designed around and intended for specific Pokemon to use them despite being available for use by a wide variety of Pokemon. It's kind of interesting looking at how these moves were originally implemented in Gen 1 and the more I look at Gen 1's game design and roster this particular tendency sticks out to me.