The second method is devouring, using Sharu's ability to forcibly absorb some of Buu's flesh cells, and if that doesn't work, use the Dragon Balls to wish to enhance Sharu's devouring ability.
So.
Su Xin returned to Earth, and while Bulma and the others were collecting Dragon Balls to revive Gohan, he appeared in front of Shenron first and said loudly:
"Shenron, tell me Majin Buu's location."
In the dark sky, the majestic and imposing Shenron's eyes flashed with a red light and then said:
"Alright, your wish has been granted."
At this time, the Earth Dragon Balls had already been improved, enabling two wishes at once, so it didn't affect the resurrection of Gohan and the others.
Yet Bulma and the others were startled by Su Xin's sudden appearance, but fortunately, Turtle Immortal recognized Su Xin's appearance and stopped Qiqi from uttering curses, curiously asking:
"Su Xin, the Majin Buu you're looking for, who is that?"
