This transformation has only been achieved by goku after billions of years of intense training in the other world. He was only able to maintain it for a few seconds but the amount of energy being prodced was so great it almost destroyed the universe. Advertisement.
What’s Goku’s final form?
Super Saiyan 3 cranked up the insanity level even more, marking the strongest Saiyan form in Dragon Ball Z. It would eventually be trumped by Super Saiyan God and Super Saiyan Blue in Dragon Ball Super, but in the context of Dragon Ball Z, it was Goku’s “final” form.