Alongside his five comrades, he started a revolt against evil Saiyan race. In spite of relating to Saiyan race, Yamoshi had a noble heart. They said Yamoshi’s five righteous comrades helped him to transform into Super Saiyan God but like Goku, his transformation didn’t last long and overwhelmed by evil Saiyans which leads to cause their death.
You know why Goku needed five other Saiyans to become Super Saiyan God? The answer is lies within Namekian Book of Legends.
