As the hatred arises, he wishes to awake the true nature of the Gizoid. Eggman has researched and learned about this.
But later, he found it is a weapon programmed to destroy, and its imitating ability makes it even become more dangerous. Sonic then discovered and used the emerald to make it work again. Nevertheless, it was built by ancient technologies, which is the point that made it difficult for him to analyze and even unable to operate, so he decided to abandon it at Emerald Beach. However, it had been unearthed by Professor Gerald Robotnik for the aim of later research. But as the fading invaded, with wars everywhere, the Gizoid was buried. Four thousand years ago, when the ancient civilization was in a flourishing period, they created a destructive weapon, called the Gizoid, in the form of a robot.