Kamesennin  Mutenroushi As a former champion of the Budokai, Son Goku learned  quite a bit from him. When Son Goku first saw Kamesennin use  the "Kame Hame Ha" early in the Dragon Ball series, Kamesennin  became his first Sensai. Goku's potential was slowly realized  through his training. Kamesenin influenced Son Goku beyond  fighting tehnique. He had always believed that one should always  seek to improve no matter what level of skill one is in. In the  first competition, he purposely joined the contest and defeated Goku  such that he'll have someting to strive for rather than being  content. In the second competition, he purposely forfeited the fight  against Tenshinhan to show that there is always someone  better. What he taught Goku is readily apparent as Goku  spared the lives of his opponents hoping to meet a greater challenge  in the Future. Also, even after defeating Freeza and there is no  apparent warrior who is stronger, he still sought to improve his  skills rather than returning to earth. His significance,  however, faded quite dramatically in Z. He is portrayed as nothing  more than just a dirty old.