There are two in granite cave one by going up the steps on the first floor and another by using a mach bike to fully explore the cave.
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Nothing. An everstone is just a hold item to stop the Pokemon from evolving.
No Pokemon evolves with an everstone. In fact, an everstone negates the effects of evolution if you give it to a Pokemon to hold.
What u do with a everstone is u give it to a Pokemon and it wont evolve
The everstone stops evolving all Pokemon that evolve in the first place.
In Pokemon Blue, the Everstone can be obtained by defeating wild Geodudes and Gravelers in Rock Tunnel. These Pokemon have a 5% chance of holding an Everstone when encountered. The Everstone prevents a Pokemon from evolving when held, making it useful for trainers who want to keep a particular form or moveset. Remember to save your game before battling these Pokemon to increase your chances of obtaining an Everstone.