In the Pokémon My Mystery Rules game, we will encounter a lot of "Pokémon My Mystery Rules" old ruins location details. Many users have a headache when they encounter this problem. I read this article by the editor. The solution to the problem, you will find that this problem is really simple.
From the big city, walk down through the cave to Wano-sato. The ruins are a one-way road back from Wano-sato.