Can Goku go Super Saiyan 4?
When you look at Dragon Ball Super's timeline,
there is no way for Goku to have even learnt Super Saiyan 4; The hero unlocked that transformation in Dragon Ball GT, and that show is set after Dragon Ball Super. ... If Goku refers to SSG as his fourth form, then fans are not sure why the hero would name SSJ4 as such.
Why is Super Saiyan 4 so popular?
SSJ4 is
loved because of the lore behind it. It combines two Saiyan transformations into a single one. It captures both call backs to the original DB and DBZ anime. Even the the golden oozaru form is a callback to the anime only form in the Namek saga.
How did Goku turn SSJ4?
in FighterZ, GT Goku will transform into Super Saiyan 4 mode
when performing Dragon Fist Explosion with one teammate down.