See The Wall That Must Be Passed! Goku vs Gohan

As Gohan finishes training with Piccolo, they meet up with Goku, Master Roshi, Tien, and Chiaotzu. At Gohan's request, Goku and Tien have a fight against Gohan and Piccolo to practice for the Tournament of Power. Although Tien views this as a practice match and wants to avoid injuring anyone, Gohan and Goku take the fight seriously. As Gohan fights both his father and Tien, Piccolo spends the time charging a strong technique that ultimately destroys the mountain they were using as a ring. Though Goku agrees when Tien calls off the match, he accepts Gohan's request for a one-on-one fight that ends with Super Saiyan Blue Goku using the Kaio-ken to defeat Gohan. Goku expresses being impressed enough with Gohan that he assign his son as their team captain. Meanwhile, with Gowasu too flustered to the Tenth Universe's Destroyer Rumsshi (ラムーシ, Ramūshi) recruited a powerful fighter named Murichim (ムリチム, Murichimu) and his nine companions to represent them in the Tournament of Power.