Rash, A.K.A. Experiment 259, is an illegal genetic experiment created by Jumba Jookiba. He is designed to give you a perfect rash if you touch him.
Experiment 259 was the 259th genetic experiment created by Jumba with Hämsterviel's funding. He was designed to give you a perfect rash if you touch him.
259 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 the unknown point, he was activated, captured, tamed and named Rash.