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Description
Back when Regional Forms were first introduced in Sun/Moon, the idea was kept pretty simple (while also being exclusively for Generation 1 Pokémon).
All of the Alolan forms were:
1. Forms where the entire evolutionary line is affected
2. Forms that were merely forms of an evolution, caused by evolving specifically in the Alola region

So to me it makes sense to call the second category "Regional-evolution forms", as the forms are dependant on evolving in that region (meaning you cannot "breed" for example an Alolan Marowak in Galar, as you get a Cubone and have no way to take it to Alola to evolve it into the Alolan form of its evolution)

Sword/Shield made things a lot more interesting. Not just have we gotten regional forms for Pokémon from several other generations, it feels like they tried to make as many unique twists as possible.
-there is regional forms affecting entire evolutionary lines, but also including one for a Pokémon that already has a Form-gimmick (Zen-Mode Darmanitan)
-there is another regional-evolution form with Weezing
-there is a regional form for a Pokémon that has a baby-stage, but without a regional form for the baby-stage (while also shifting the placement of its Psychic type upon evolving, but that's a whole different story..), making Mr.Mime a special case that could technically be considered a Regional-evolution form...if it wasn't for the fact that Mr.Mime is also a base stage and can therefore produce Mr.Mime eggs....
-there is regional forms for a group of legendaries (which is just unexpected)
-there is a regional form for a Pokémon that already got a regional form the previous generation (Meowth)

And then there is the biggest surprise... actual cross-generational evolutions. But with the catch that they are exclusively evolutions of regional forms, but not being regional forms themselves.
And as if that wasn't enough, two of them are technically split evolutions as well, but since they're not regional forms, they are split evolutions to nonexistent regional forms of the regular evolutions.

I have seen many Pokémon Fans refer to these new evolutions as "Regional evolutions"... but if you've read all of this so far, you can already guess that I think that this is kind of incorrect and potentially misleading.
As we already have regional forms that ARE exclusively obtained through "evolution" in a specific "region" (which I therefore call the Regional-evolution forms above),
while these "regular" new evolutions (it's safe to assume a Galarian Linoone will evolve into Obstagoon at Lv35 and nighttime regardless what region it is in when the evolution requirements are met, the Galarian influence is already in the whole line) are NOT dependent on the region, and are also NOT Regional Forms to begin with, so calling them anything "regional" just because their previous stages ARE regional forms is technically incorrect.

And that's why I call them Regional-form evolutions, as they are plain evolutions of Regional forms.

--UPDATE 02-2022 (Legends: Arceus)--
Wow. I did not expect a bridging game / replacement of a remake to be this wild in the ways it expands existing Pokémon families.

Fortunately, even though the forms are for Pokémon across all generations, they still fit into the categories that SwSh has set up. So there is Regional evolution-forms, there's full regional forms, there's evolutions of regional forms.
The interesting thing is, that the majority of the new forms are actually regional evolution-forms (which is the category that went the most underused in Galar, just introducing Galarian Weezing).
Specific interesting cases include:
-Sneasel getting the Perrserker/Runerigus treatment
-Basculin officially being called the "White striped form" to complement the existing red/blue-striped forms, rather than being a Hisuian form (which is why I hesitated including it on this graphic)

Of course on top of all these forms and evolutions, Legends also introduced numerous ACTUAL new evolutions. They are not featured on this graphic, because they are not regional-forms, nor evolutions exclusive to regional forms. If they were on the graphic, it would be a general cross-generation evolution graphic and would have to include everything from the Gen2/4 evolutions like Crobat and Electivire, to eeveelutions, and possibly Mega evolutions etc., none of which is what this is supposed to be about.

(Artworks of individual Pokémon are owned by Nintendo/Gamefreak/Pokémon company, used merely for purposes of informative nature)

Description
Back when Regional Forms were first introduced in Sun/Moon, the idea was kept pretty simple (while also being exclusively for Generation 1 Pokémon).
All of the Alolan forms were:
1. Forms where the entire evolutionary line is affected
2. Forms that were merely forms of an evolution, caused by evolving specifically in the Alola region

So to me it makes sense to call the second category "Regional-evolution forms", as the forms are dependant on evolving in that region (meaning you cannot "breed" for example an Alolan Marowak in Galar, as you get a Cubone and have no way to take it to Alola to evolve it into the Alolan form of its evolution)

Sword/Shield made things a lot more interesting. Not just have we gotten regional forms for Pokémon from several other generations, it feels like they tried to make as many unique twists as possible.
-there is regional forms affecting entire evolutionary lines, but also including one for a Pokémon that already has a Form-gimmick (Zen-Mode Darmanitan)
-there is another regional-evolution form with Weezing
-there is a regional form for a Pokémon that has a baby-stage, but without a regional form for the baby-stage (while also shifting the placement of its Psychic type upon evolving, but that's a whole different story..), making Mr.Mime a special case that could technically be considered a Regional-evolution form...if it wasn't for the fact that Mr.Mime is also a base stage and can therefore produce Mr.Mime eggs....
-there is regional forms for a group of legendaries (which is just unexpected)
-there is a regional form for a Pokémon that already got a regional form the previous generation (Meowth)

And then there is the biggest surprise... actual cross-generational evolutions. But with the catch that they are exclusively evolutions of regional forms, but not being regional forms themselves.
And as if that wasn't enough, two of them are technically split evolutions as well, but since they're not regional forms, they are split evolutions to nonexistent regional forms of the regular evolutions.

I have seen many Pokémon Fans refer to these new evolutions as "Regional evolutions"... but if you've read all of this so far, you can already guess that I think that this is kind of incorrect and potentially misleading.
As we already have regional forms that ARE exclusively obtained through "evolution" in a specific "region" (which I therefore call the Regional-evolution forms above),
while these "regular" new evolutions (it's safe to assume a Galarian Linoone will evolve into Obstagoon at Lv35 and nighttime regardless what region it is in when the evolution requirements are met, the Galarian influence is already in the whole line) are NOT dependent on the region, and are also NOT Regional Forms to begin with, so calling them anything "regional" just because their previous stages ARE regional forms is technically incorrect.

And that's why I call them Regional-form evolutions, as they are plain evolutions of Regional forms.

--UPDATE 02-2022 (Legends: Arceus)--
Wow. I did not expect a bridging game / replacement of a remake to be this wild in the ways it expands existing Pokémon families.

Fortunately, even though the forms are for Pokémon across all generations, they still fit into the categories that SwSh has set up. So there is Regional evolution-forms, there's full regional forms, there's evolutions of regional forms.
The interesting thing is, that the majority of the new forms are actually regional evolution-forms (which is the category that went the most underused in Galar, just introducing Galarian Weezing).
Specific interesting cases include:
-Sneasel getting the Perrserker/Runerigus treatment
-Basculin officially being called the "White striped form" to complement the existing red/blue-striped forms, rather than being a Hisuian form (which is why I hesitated including it on this graphic)

Of course on top of all these forms and evolutions, Legends also introduced numerous ACTUAL new evolutions. They are not featured on this graphic, because they are not regional-forms, nor evolutions exclusive to regional forms. If they were on the graphic, it would be a general cross-generation evolution graphic and would have to include everything from the Gen2/4 evolutions like Crobat and Electivire, to eeveelutions, and possibly Mega evolutions etc., none of which is what this is supposed to be about.

(Artworks of individual Pokémon are owned by Nintendo/Gamefreak/Pokémon company, used merely for purposes of informative nature)