Mobius Encyclopaedia
The subject of this article appeared before the Super Genesis Wave.

Solar Sonic speeding through the Great Desert

Solar Sonic is a variant of Sonic the Hedgehog's alternate super forms. He achieved this form while running at high speeds through the Great Desert just outside of Sand Blast City while using Nate Morgan's Super Emerald to return Knothole to regular time. He has only made this transformation once and it seems probable that the environment influenced his change to this state as well as Polar Sonic and Eco Sonic after becoming Ultra Sonic and traversing across all of Mobius. (StH: #71)