As for the Official Generations of Pokémon, I imagined Pokémon obtained from fossils found during the player's adventure.
This Fossil Pokemon is acquired by reviving it from the “Hot Scales Fossil” (item that can be found by digging in a certain area)
This Pokémon is inspired by Allosaurus fragilis, a large carnivorous theropod dinosaur that lived during the Late Jurassic era.
The Allosaurus is the T.rex of the Jurassic period, it may not have been as large or as imposing, but this dinosaur is one of the best known by both paleontologists and the general public.
The Fire type was not the type originally chosen. Originally, he had to be Ground-type or Dragon-type like Tyrantrum. But after some research for innovative ideas, for a Fossil Pokémon, an idea of a scale that works like stones that burn from the inside, or like red-hot iron.
The Shiny decreases the saturation of brown body colors. The bright red scales become bright blue, this change of colors is to refer to the blue flames (moreover this change of colors from red flame to blue flame, is recurring in the shiny Fire-type Pokémon).