How does Goku turn super Saiyan 4?

Related questions

1. Is Goku the strongest Saiyan ever?
2. Is ssj4 stronger than Beerus?
3. Who is stronger ssj4 or SSJ blue?
4. Who beat Omega shenron?
5. Who is stronger Broly or Beerus?
6. Who is Xicor in DBZ?
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Tags

1. #granddaughter
2. #vegeta
3. #power
4. #rejuvenated
5. #after
6. #however
7. #first
8. #dragon
9. #waves
10. #saiyan
11. #golden
12. #bulma
13. #great
14. #crying
15. #becomes
16. #generator
17. #achieved
18. #transforming
19. #blutz
20. #super
21. #witnessing