How Goku and Gotenks unlocked Super Saiyan 3 created a compelling theory as to why Vegeta never did. But Dragon Ball Daima episode #12 disproves it.
Dragon Ball Daima Episode 12 saw Vegeta unleashing his own take on the Super Saiyan 3 form, and it was immediately different from Goku’s. When Goku had first used Super Saiyan 3 in the fight ...
In Dragon Ball Daima episode 12, Vegeta transformed into Super ... Vegeta managed to put up more of a fight against Beerus in his Super Saiyan 2 form than Goku managed to with Super Saiyan 3.