User blog comment:Blackendedsoul/Simple question in a crooked manner, Yonkou selection./@comment-3563898-20110621182211

Like Jinbe said before me, there probably isn't any official way of becoming a Yonkou. You just have to take over multiple islands and become extremely notorious. Blackbeard is probably the new Yonkou, having 2 years to hone his new Gura Gura no mi powers. People will recognize him as the new Yonkou for sure.