Jirou was the closest to beating Acacia in his unevolved form because of having used million knocking on him.
But he did lose him because he wanted to talk to him. He could still have fought but he lost to his own damage knocking. The damage he took was great enough to destroy the earth 3 times.
This chapter was so amazing. I loved how Guinness tried to sent intoo oblivion every single piece of Neo because of Jirou's death.
And Derous tho, bruh. That thing put to shame Final Flash of Vegeta. rofl