To get the everstone on Pokemon Leaf Green, you will need to catch 20 Pokemon. Once you have achieved this, visit the rock tunnel. Inside the rock tunnel, you will be greeted by a man who will grant you the ever stone.
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you can't catch a gengar. you catch a haunter then trade it so it evolves. make sure its not holding an everstone. ;)
No Pokemon evolves with an everstone. In fact, an everstone negates the effects of evolution if you give it to a Pokemon to hold.
The way to evolve Haunter has been, and will always be, by trading. If you have a Haunter in Pokemon Emerald trade it to Sapphire, Ruby, Fire Red or Leaf Green and make sure he isn't holding an EVERSTONE as that will prevent its evolution.
you can't get mamoswine in Pokemon leaf green because it doesn't exist in leaf green
behind the door is leaf green u enter the Pokemon leaf green world