This is a remake of Nobita's Dinosaur (1980), in which the main character Nobita uses one of Doraemon's gadgets to revive the fossilized egg of a plesiosaur and keeps the hatchling as a pet. I found the original plot to be serviceable but straightforward and relatively unremarkable, and it has not been changed much in this movie outside of minor details. However, the remake does include some tweaks to the climax and additional character moments that I liked. It is also visually interesting; besides the switch to digital animation and updated designs for many of the extinct animals, the art style in this film is much more experimental than that of most other Doraemon movies.
If you could only watch one version of Nobita's Dinosaur, either the original or the remake are fine to view on their own, and I give both the same rating. This one is arguably a better movie by a small margin, though the original has the context of historical novelty going for it.
