Board Thread:Fun and Games/@comment-27996636-20171110175955/@comment-33565364-20171121223651

Well Goku did teach goten and trunks SSJ3 in DBZ, when he showed them all the SS levels in that tower in the Buu Saga. I think it should be hard to teach normal saiyans blue as it is a godly SS and Vegeta was a prince so that's why he might have figured it out.