How did Vegeta really achieved Super Saiyan 2?

I stand by my battered and bruised theory that as it is stated in the manga the requirement for Majinization is an evil heart. Babidi merely pondered that perhaps it was Vegeta's pride that gave him

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How did Vegeta achieve Super Saiyan God?!

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How did Vegeta really achieved Super Saiyan 2?

Can Super Saiyan 3 Goku and Vegeta beat Super Saiyan 2 Gogeta? - Quora

When does Vegeta go Super Saiyan? - Dragon Ball Guru

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