Here's how the finale of Dragon Ball Daima explains why Goku never uses Super Saiyan 4 in the follow-up series, Super.

Goku’s Super Saiyan 4 transformation in Dragon Ball GT had to be in adult form because it was the strongest form and Toei wanted visual impact.

Thanks to Dragon Ball Daima, Dragon Ball is now one big step closer to making Super Saiyan 5 an official part of the series’ ...

These fusion methods have been shown in use by Goku ... Saiyan Blue, fans have always wanted to see them with the unadulterated strength of a Super Saiyan 3, so let's look at how this can be done ...

As far as the Dragon Balltimeline goes, Dragon Ball DAIMA is set nearly 15 years before the events of Dragon Ball GT. Formidable as Vegeta and Piccolo may be in the currently ongoing anime, they ...

As Super Saiyan 3 Goku struggled to deal any real damage to Gomah, Neva used his magic to spark a new kind of transformation within Goku. This turned out to be a new version of the Super Saiyan 4 ...

All of this serves to get viewers hyped before the true star of the episode, Super Saiyan 4 Goku, appears. Empowered by Neva, Goku is able to ascend to his Dragon Ball GT counterpart's signature ...

The return of beloved characters, such as Goku and Vegeta ... but it could be something like Super Saiyan 4, which is technically non-canon, or even something entirely new. Only time will tell ...