Sol, A.K.A. Experiment 554, is an illegal genetic experiment created by Jumba Jookiba. She is designed to destroy the ozone layer (hence her name (S solar, O ozone and L layer)).
Experiment 554 was the 554th genetic experiment created by Jumba with Hämsterviel's funding. She was designed to destroy the ozone layer.
554 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
All of the experiment pods were released and scattered across the island of Kauai.
At an unknown point, 554 was activated, captured, tamed and named Sol.