No Pokemon evolves with an everstone. In fact, an everstone negates the effects of evolution if you give it to a Pokemon to hold.
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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.
There is 2 ways to stop evolving: During the Pokemon's evolution keep pressing the B button to stop the evolution, also have the Pokemon hold the item everstone no matter what level the Pokemon is it will never evolve if it's holding that item and if it evolves during trade if it's holding the everstone it still will not evolve.
you can't catch a gengar. you catch a haunter then trade it so it evolves. make sure its not holding an everstone. ;)