Where is Maristone in Dragon Ball Z: Kakarot? You need to find this rare material in order to complete the 'Tourists in Trouble' side quest during the Frieza Saga. However, Maristone is particularly tricky to find.
Where to find Maristone in Dragon Ball Z: Kakarot
During your time on Namek during the Frieza Saga, you'll only come across two or three side quests. One of them, titled Tourists in Trouble, has you find a rare material called Maristone for an old alien couple who are visiting the planet. However, the game will only place a search area on your map, rather than an objective marker.
Here's the thing: no matter how hard you search the area, you won't be able to find the Maristone. That's because you need to blow up one of the large rocky hills that dot the location. Find the right rocky hill, smash it with a ki blast (hold L2 and press square, or hold square for a more powerful blast), and you'll find the Maristone where the rocky hill used to be.
Here's where the rocky hill is on the map:
And here's where the rocky hill used to be once you've blown it up. Basically, it's the one closet to the middle of the search area:
Once you have the Maristone, head back to the alien couple, beat up Frieza's henchmen, and you'll complete the quest.