>>57987449
No, Relicanth is a living fossil that found a stable ecological niche, similar but on a smaller scale to some of Hisui's Pokémon that found this in Kitakami. Like the Coelacanth or the Sakhalin taimen in real life.

The closest thing to AEs would be the chickenosaurus project, which is genetically engineered to stimulate dormant genes like teeth, tails, and claws, or the new dire wolves, which are actually gray wolves that have been manipulated to give them a phenotype similar to that extinct species.