The Pokemon that know it are golbat and a couple others that i can't remember, but wobbufett has the ability shadow tag which has the same effect as mean look!
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Any ghost type Pokemon can learn it.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Look it up on Serebii.net it has every thing you can think of about Pokemon in all of the games
look around route 24 a left at the bridge
If you mean evolution stones. You can buy them at the shop in Celadon