Answer (1 of 9): Goku learned how to transform into Super Saiyajin 3 while in heaven, after he died when Cell self-destructed, according to Goku himself. He couldn’t fully control the form though, and its energy consumption was enormous. Using a power like that in the living world with a dead bod
How does Goku transform into a Super Saiyan 2 for the first time and how does he train to be able to transform? - Quora
Dragon Ball: 15 Things Fans Need To Know About Super Saiyan 3
How did Goku transform into a Super Saiyan? - Quora
Dragon Ball Z: Is Super Saiyan 3 Goku More Powerful Than Ultimate Gohan?
Dragon Ball Z Cosplay Takes Super Saiyan 3 Goku Even Further Beyond
When did Goku transform the first time in a Super Saiyan 3 and how did Goku learn to transform into a Super Saiyan 3? - Quora
Could Goku use Kaioken as a Super Saiyan God? - Quora
How did Goku discover Super Saiyan 3? - Quora
How did Goku discover Super Saiyan 3? - Quora
Why didn't Goku transform into a super Saiyan god in DBGT? - Quora
