Dr. Olivia Morales was a renowned geologist and toxicologist working to clean up polluted environments. While investigating a contaminated swamp in the Paldea region, Olivia uncovered a hidden grotto containing ancient Paldean Wooper fossils. As she examined the fossils, she was exposed to a mysterious, glowing substance that altered her physiology, granting her extraordinary powers. Embracing her new abilities, Olivia became Toxica Terra, a superheroine dedicated to purging pollution and protecting the natural world.