Dragon

Dragons (class Dracones) is a class of amniote Pokémon that are closely related to reptiles and dinosaurs, with some having the appearance of birds, insects, dinosaurs, or fish because of convergent evolution, but diverged from other reptiles before the archosaurs evolved. They are sister to sauropsids (including reptiles and birds) and synapsids (including mammals).

Description
There isn't a clear description of dragons, as they all resemble all sorts of creatures because of convergent evolution, but most are Dragon-types, with the exception to and, which are both Water-types. Many dragons are pseudolegendaries or legendaries as well.