In ancient times, the Golden Dragon, Dragold, brought the B-Crystal with him to the human world, intending on conquering it using its mysterious powers. However, he was thwarted by the other four Legendary Dragon B-Animals; Dracyan, the Blue Dragon, Dravise, the White Dragon, Dragren, the Red Dragon, and Drazeros, the two-headed Black Dragon. Dragold was defeated and sealed away in the form of a B-Daman and put into a dormant state.
Centuries later, Dragold was re-awakened by the renegade B-Der, Novu Moru, as part of a scheme to take over the world through both Dragold and the B-Crystal's powers, when the Golden Dragon itself took possession of Rudy Sumeragi as the host of his power. Eventually, Dragold and Rudy betrayed Novu, intending on taking over the world themselves, by absorbing all of the world's B-Animals through the B-Crystal to increase their own power.
However, the B-Animals of the other 4 Dragons and Lightning Diles did not get absorbed. When Rudy was defeated in the Final Break Bomber challenge, he was freed of Dragold's influence. Seeing how badly his plans affected Rudy, who cried tears of shame, Dragold apologized to him, gifting him with a glowing, golden marble, before disappearing.