A so-called pureblood dragon is a noble dragon-type pet beast that possesses a large amount of pure and ancient dragon blood in its body, such as Chi, Qi, and Jiao, among others.
These powerful creatures have a minimum species level of King, and they are born with the ability to comprehend the core evolution skill "Rain Dance".
Under the careful nurturing of a trainer, as long as a pureblood dragon acquires enough pet resources, it has a good chance of soaring up and transforming into a dragon.
It is rumored that with the continuous purification and transformation of their dragon blood, powerful true dragons might even have the chance to evolve into the most ancient and pure-blooded noble existence amongst dragons: the Supreme Dragon God.
Unfortunately, up to this point, there hasn't been any strong trainers within the Flowery Kingdom who have witnessed this supreme existence in person. Thus, this claim is mostly regarded as baseless talk.