Yellow Lantern was the Bizarro version of Green Lantern (Hal Jordan), who had a yellow power ring (unable to affect the color green) that must be recharged before its 24-hour charge is used up. Since his power ring soon became useless and he was a spineless coward, he naturally became the Bizarro World's greatest hero. A member of the Bizarro Justice League, he was temporarily given Bizarro-Aquaman's powers during Bizarro-Amazo's shenanigans. These were later taken away.
In the post-Crisis universe, Yellow Lantern and the rest of the Bizarro World never existed. However, he may still exist in a pre-Crisis-derived hypertimeline.