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The game's got almost no extra areas to explore. The desert is so forgettable most people don't realize it exists, a fact not helped by it being walled off for no good reason. Lake of the Moon or whatever the fuck has literally nothing, and Resolution Cave is a hallway. Hell, the whole game is a hallway.
Good RPG's have side areas you can dive into and take a bit of a break from the story, but not Alola.