From the Super Mario Wiki
Dragons are a race of mythological reptiles in the real world which have appeared as real creatures throughout the Mario series as either enemies, bosses, allies or gameplay elements. They also made numerous appearances as bosses in Mario RPG games such as Super Mario RPG: Legend of the Seven Stars, the Paper Mario series and Mario & Luigi: Superstar Saga.
The Adventures of Super Mario Bros. 3
The Dragon from "7 Continents for 7 Koopas" in The Adventures of Super Mario Bros. 3
In The Adventures of Super Mario Bros. 3 in the episode "7 Continents for 7 Koopas", after Bully Koopa painted graffiti all over the Great Wall of China, Mario appears, snatches Bully's wand, and turns the Great Wall into a dragon, which chases after Bully.
Names in other languages
|Dragon. It is worth noting that doragon usually refers to a dragon from European, rather than Asian mythology which are referred to as ryū.