Great Revolution
From The Bakugan Wiki
The Great Revolution was the event that brought about the creation of Vestroia, the Bakugan universe. It occurred after the creation of Genesis Dragonoid and Dharaknoid were created by Code Eve. Genesis Dragonoid created Vestroia, and began the ancestor of the Bakugan that lived there. Dharaknoid became the ancestor of the Bakugan that developed on Neathia and Gundalia.
This also gave birth to a race of non-Attributed Bakugan called the White Ones, who resided in the center of the Vestroia universe.