one of prf. oaks aids has it for completeing 20 on your pokedex. he sitting at the table in the pokecenter near the power plant
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People gve an everstone to you as a gift,on some occasions.
An everstone is used to prevent evolution
Only one is provided in the game, but you can trade one from someone else.
You can find everstones underground
No Pokemon evolves with an everstone. In fact, an everstone negates the effects of evolution if you give it to a Pokemon to hold.