Vegeta Unlocked Super Saiyan Because of a Loophole in Dragon Ball Lore

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While every Dragon Ball fan knows Vegeta can go Super Saiyan, he wasn't always able to, but he finally unlocked the form because of one loophole.

Vegeta's ability to go Super Saiyan was originally hindered by his impure and evil heart, but he found a loophole in Dragon Ball lore to achieve the transformation.
Despite being a villain in the past, Vegeta's training and newfound strength allow him to go Super Saiyan and showcase his power to the shocked Z Fighters.
Vegeta's realization that being true to oneself and having a calm heart filled with a defining trait, even if it is pure evil, can still lead to unlocking the Super Saiyan transformation.