There are several Saiyajin transformations in the series, which are: Oozaru, Pseudo Super Saiyajin, Super Saiyajin, Super Saiyajin Second Grade, Super Saiyajin Third Grade, Super Saiyajin Full Power, Super Saiyajin 2, Legendary Super Saiyajin, Super Saiyajin 3, Legendary Super Saiyajin 3, Super Saiyajin God Super, Saiyajin God Blue, Super Saiyajin Rosé, Golden Oozaru, and Super Saiyan 4.



All saiyans can transform into Oozarus (Great Apes) when they look directly at the full moon.



The false Super Saiyajin transformation is used only by Goku when he fights Slug in the "Lord Slug" Movie.



The Super Saiyajin transformation is used by Goku, Vegeta, Bardock, Gohan, Goten, Trunks and Broly.



As for the SSJ2 transformation, it is achieved first by Gohan during the Cell Sage and then by Goku and Vegeta.



The Legendary Super Saiyajin form comes next and it is only achieved by Broly. This transformation is superior to the SSJ2 transformation since in the movie "Broly the Second Coming", LSSJ Broly defeats SSJ2 Gohan before SSJ2 Goku, SSJ2 Gohan and SSJ1 Songoten defeat Broly with a combined Beam Attack.



In the Dragonball anime serie, only Goku can transform into a SSJ3.



And next comes the Super Saiyajin God form which is a special transformation which requires the power of 6 pure-hearted saiyans



And finally, the blue Super Saiyajin transformation which is how look saiyans characters when they have god ki. This new transformation is seen in the DBZ Movie "The Revival of Freeza".



Golden Oozaruis an alternative and far stronger type of Great Ape that is seen in Dragon Ball GT. It is the result of a Saiyajin in Great Ape form becoming a Super Saiyajin.



Then, in Dragon Ball GT, both Goku and Vegeta transform into Super Saiyajin 4s. For Vegeta, he managed to become a Super Saiyajin 4 with Bulma's help while Goku can transform freely into this form.