Experiment 171 was the 171st genetic experiment created by Jumba with Hämsterviel's funding. He was designed to give you counterfeit money..
171 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.
He works with 172 and 173. When Jumba was making 171 the embryo split into 3 so he only has 2 of the 6 powers he was supposed to intelligence and strength. He is good, but he is weak-willed and is usually bullied into being evil by 172.
At an unknown point, 171 was activated, captured, tamed and named Rich.