*spoiler* Vegeta at first however when goku manages to beat him vegeta gets angry and try's to become stronger than goku but never succeed and while trying to become stronger he takes out the bad guys with goku and slowly but surely he becomes a good guy.
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Vegeta!!!
Depend on which version of Goku you're speaking of: Goku SSJ1 vs Majin Vegeta: Majin Vegeta Goku SSJ2 vs Majin Vegeta: Equal Goku SSJ3 vs Majin Vegeta: Goku Goku SSJ4 vs Majin Vegeta: Goku
Right. It's because Vegeta visted Goku and Vegeta forgot that he had ammnesia and later Goku said he was a good guy.
because vegeta is the prince of all saiyans and goku is a lower class rank and goku is always one step in front of vegeta.
Vegeta is bad at first but then becomes good allys with Goku. He's always a bit, er, grumpy through out the whole show though...