Pokemon Sword and Shield introduced some wonderful new Legendaries, but some normal creatures could also fit that category.
Each Generation has some super rare and powerful Pokemon, that don't have a Legendary or Mythical label placed upon them. Generation VIII is no exception to that.
There are oftentimes pseudo-Legendary Pokemon introduced, and Sword and Shield does that with Dragapult. Outside of that Dragon/Ghost-type, there are three Pokemon that could have also used the actual Legendary title.
3 Pokemon who could've been Legendaries in Sword and Shield
#3 - Stonjourner
Stonjourner is a simple Rock-type Pokemon introduced in Sword and Shield. It has decent Attack and Defense stats, but everything else is mediocre. Stonjourner could have certainly been given better stats and status as a Legendary Pokemon in Generation VIII.
It is said to resemble/represent the mysterious rock structure known as Stonehenge, an iconic location. Therefore, the Pokemon based on it should have been made Legendary. It could have been a cool piece injected into the story.
#2 - Dracozolt
All the Fossil Pokemon should have been Legendary in Sword and Shield. They are all sorts of abominations with two different Fossils smashed together. No one really cares for Arctovish or Arctozolt, but Dracozolt is very popular.
It is an Electric/Dragon-type Pokemon that is a brutal attacker in competitive battling. These ancient creatures should have been made into Legendary Pokemon. The story behind it could have been incredible.
#1 - Dracovish
Dracovish is maybe even more popular than Dracozolt. It immediately became a force in battles with a crazy learnset and a signature move known as Fishious Rend. Dracovish saw the type power that even some Legendary Pokemon never see.
Along with the aforementioned Electric version, this Water/Dragon-type could have been a great Legendary Pokemon. Categorized as a Fossil Pokemon, Dracovish has all the makings of the Legendary label.