Vegeta Confirms Broly Isn't the Rarest Saiyan… It's Trunks

Despite the fact Broly is a Legendary Super Saiyan, he still isn
Despite the fact Broly is a Legendary Super Saiyan, he still isn't the rarest Saiyan in Dragon Ball, and Vegeta confirms that honor goes to Trunks.

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Vegeta Confirms Broly Isn't the Rarest Saiyan… It's Trunks

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How was Broly able to fight Goku Super Saiyan Blue and Vegeta Super Saiyan God in his base from in Dragon Ball? - Quora

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Dragon Ball's Scariest Villain Actually Stole His Greatest Power From a Hero

Vegeta (Dragon Ball SF), Dragonball Fanon Wiki