Evol

The Evol monsters are a series of three FIRE attribute sub-archetypes: Reptile-Type "Evoldo" monsters, Dinosaur-Type "Evoldar" monsters and Dragon-Type "Evolkaiser" monsters. "Evoldo" monsters Special Summon "Evoldar" monsters, who gain a variety of effects, when Special Summoned by the effect of "Evoldo" monsters, and "Evolkaiser" monsters who are Xyz Summoned by using Dinosaur-Type monsters as materials.

The Evol are a toolbox archetype, similar to Gladiator Beasts, in that they gain their effects when they are special summoned by other evols. Each Evol is similar to monsters from other arhcetypes.

These are the Evol and the cards that they are based off.

The archetype name, Evol, is probably derived from evolution.

They are based on evolution from Reptiles → Dinosaurs → Dragons. This is referenced in some cards, such as Ultra Evolution Pill.