One that struck me lately as a particularly funny one as of late is Braviary's Shield Dex entry.
:xy/braviary:
Braviary, Shield: "Because this Pokémon is hotheaded and belligerent, it's Corviknight that's taken the role of transportation in Galar."
This may not seem like much, considering it's Galarian culture that Corviknight function as flying taxis that people use to travel across various locations in Galar. So why mention Braviary? Because it's so strong it can pick up a car? Was it ever used as a means of transportation in the past? Certainly no dex entry in the past has ever mentioned it being used as a means of transportation outside of the fact that one of its BW1 dex entries mentioned it's so strong it can carry a car while flying.
But then enter Legends: Arceus and with it...
Hisuian Braviary!
Now what does this have to do with the Shield Dex entry for Braviary? Hisuian Braviary is not only a regional and ancient form of Braviary, it's from a different region from Galar and from a time period that was long ago before the modern Pokémon universe came to be. And what is one big standout thing about it that we saw, right away from the trailer it debuted it in?
It was commonly used in Hisui as a means to fly around. The trailer showed many clips of the player characters riding on special equipment to hang onto underneath a Braviary to fly around Hisui.
The Hisuian form of Braviary, native to this particular region, was historically used as a means of transportation in the Hisui region, long before it came to be known as Sinnoh. You can see many clips in the second trailer that showcase its use as a reliable flight transport for people of Hisui to go from place to place through the air.
So it would seem that modern day Braviary, being very hotheaded and combative, aren't as reliable for transport as their older Hisuian counterparts, who while we cannot infer much of their behavior yet, appear to be not only larger, but overall ironically have a less belligerent and perhaps more approachable disposition than the Braviary of the modern day who come from Unova, Alola, and Galar. So much so that they worked very reliably with humans back in this day and were basically
the means of transportation for people of this region and time.
I'm not sure if it was intentional, but it's incredibly funny in hindsight that it essentially connects well to how Hisuian Braviary served people in Legends: Arceus' Hisui region back in that time period, but in the modern day, the Braviary of the Galar region are too hotheaded and belligerent to serve that role reliably, so the people of Galar have opted to have Corviknight serve the role in its place, without risk of danger or heading into combat and harming the people it's carrying. It's a nice connection imo, especially since while Corviknight are the transportation of Galar, the trailer made it clear Hisuian Braviary has a similar function in Hisui.
(it'll be fun to see if BDSP doesn't have HMs, and if so, if there's a dedicated Flying-type Pokemon who transports people across modern day Sinnoh like Corviknight in Galar and Hisuian Braviary in Hisui).