Goten has the ability to transform into Ozaru when he looks at the full moon when his tail is is fully grown.
Super Saiyan 1
Goten first became a Super Sayian while training with Chi-Chi, and later, with Gohan.
In this from Goten is the strongest Super Saiyan at his age.
Super Saiyan 2
Goten gained the Super Saiyan 2 form In between Battle Of God Saga and Revival Of F Saga. In this form Goten is one of the five strongest Beings on the Earth.
Super Saiyan 3
Goten gained this form Super Saiyan 3 in the time he trained with his father after the Kid Buu Saga. Goten is really powerful in this form.
Goten has the ability to transform in Golden Ozaru. After transforming into Golden Ozaru Goten evolve and gained his mind back.
Super Saiyan 4
Goten Transformed into Super Saiyan 4 quickly after his Golden Ozaru. In this form Goten Can Easily defeat evil beings.
Goten has the ability to fuse thanks to the Fusion Technique. He and Trunks usually transform into Gotenks.
In this form Gotenks (Fusion Dance/Trunks and Goten) is one of the most powerful characters in the entire season of the dragon ball universe.
Goten has a special form just like his brother Gohan. Goten use this form the protect his city.
Great Saiyaman 3
In this form Great Saiyaman 3 (Goten) is just fighting in hi base form and protect the earthlings from bad guys.