This chapter of the guide to Dragon Ball Z: Kakarot has a walkthrough for Your Friend Is My Friend side quest.
Time frame: From Android Terror Arrives - Episode 4: 17, 18 and...16? to Episode 4: Cell's Ambitions
Reward: 70,842 EXP, D Medal, Ultra Brain Bread
Where to start: Northern Mountains Area, as Trunks.
Your task is to destroy two groups of robots. The places where you will find them are marked on the map.
Defeat the robots. Enemies are very weak and won't cause you any problems. Once you are done with the enemies, go back to the quest giver.