* Relic Castle: You can find a King's Rock on the 3rd floor of Relic Castle. You'll need to navigate through a maze to reach it.
* Hidden Grotto: King's Rocks are a rare item found in some Hidden Grottos. You'll need to find a Grotto with the right combination of rocks to encounter one.
Tips for finding a King's Rock:
* Explore Relic Castle thoroughly: The King's Rock is well hidden in the castle, so don't just rush through. Make sure you check every nook and cranny.
* Utilize the Hidden Grotto system: Use the C-Gear to access the Hidden Grotto system.
* Use a Pokemon with the "Keen Eye" ability: Keen Eye will allow you to find hidden items more easily.
Good luck finding your King's Rock!