You need to be playing as Goku to begin this substory, which can be found in the Sacred Land of Korin area. The trees in the area seem to have fallen prey to a mysterious affliction and there seems to be nothing Bora and Upa can do to stop it. Goku offers to help, but has no idea what to do, so he decides to go ask Bulma. Travel to Capsule Corporation and speak to Bulma, who mentions the trees are suffering from witheritis and the medicine used to cure it requires some medimoss. You’ll automatically return to Bora and Upa to tell them the problem, with Upa mentioning that maybe Fortuneteller Baba can help you track down this medimoss.

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The medimoss will be right next to the large tree

Goku teleports to her location, but you learn that her new crystal ball has been stolen by some hooligans. Go to the marker on your map to find the thieves, who will sic some robots on you. Defeat the robots, who are the same ones you’ve fought hundreds of time by now, and you’ll return to Baba with her crystal ball. She points you in the direction of the Medimoss, so fly to the marker on your map and pick it up. The rest of the substory will play out on its own, so you’re done here.