Here is a basic list of combinations that could produce a golden dragon: scorch dragon and chrome dragon.
Breeding. The Gold Dragon can be bred by using any two Dragons in any order that contain the Fire and Metal elements in any Brood Cave.
The Rare Egg of Mystery is a purchasable item from the “Dragon” section of the Rift Market that allows the player to obtain a random Rare Dragon from any Rare Dragon in the game . The rewarded dragon type follows the following order: normal, twin, and rift twin.
Breeding. The Golden Olympus Dragon can be breeded with any two Dragons in any order that contain Earth, Lightning and Air elements in any Breeding Cave.
Corrupticorn by far. You can’t get it even with a wish.
The domain of the Golden Dragon is an unofficial but highly coveted award of the United States Navy and United States Coast Guard. It is awarded to crew members of ships crossing the International Date Line.
The Snowy Gold Dragon can be bred by choosing any two dragons in any order that contain the Fire, Cold, and Air elements in any Brood Cave.
Breeding. The Triple Rainbow Dragon can be bred using any two dragons that have a total of at least four different elements in each spawn cavity.
The Nova Dragon can only be bred in the Cooperative Breeding Cave. The breeding pair of dragons must include the nova dragon and any other dragon.
The Rigel Dragon can be bred by using any two Rift-trait Galaxy Dragons in any order, while your Park contains all other Galaxy Dragons in the Rift Breeding Cave. This dragon can only be bred in the Rift.
The Kaiju Dragon is the strongest known dragon in the whole valley.