Super Sayian Goku has diffrent transformations 1 ssj 2 ssj2 3 ssj3 4 ssj4 but super sayian 4 is not canon why good you ask because goku ss4 was made in dragon ball gt wich akira toryama did not make but the added it in the saga well ss4 goku did fight goku ssb in dragon ball heros and as you can see in dragon ball xenoverse2 ultra instinct goku has ki similar to ss4 bye
