Just like how Super Saiyan 3 was seen as a seemingly exclusive form for Goku for many years before Vegeta uses it in Dragon Ball Daima, Vegeta using its power here is a way to make up for lost time.

Goku has no choice but to power up to his strongest form, SSJ3. Unfortunately, Goku’s first SSJ3 transformation against Baby Vegeta doesn’t last more than two minutes. He quickly loses power ...