Super Saiyan 3 Kid Goku vs Gomah Fight CONTINUES as part of the War in the Demon Realm. But the awakening happens as Super Saiyan 4 Goku in Dragon Ball Daima is born! Super Saiyan 4 Goku vs Gomah ...
Dragon Ball Daima Episode 20 finally revealed how Goku achieved Super Saiyan 4, but the explanation contradicts previous events and Dragon Ball Super.
Here's how the finale of Dragon Ball Daima explains why Goku never uses Super Saiyan 4 in the follow-up series, Super.