Where do you get the bolders in seafoam island?

In Seafoam Islands in Pokémon games, you can find boulders within the caves. Specifically, you need to look for the boulders in the main cave area and use Strength to move them. These boulders can be used to block water currents and access different parts of the cave. Remember to navigate carefully, as moving the boulders in the wrong order can make it difficult to reach certain areas.