You can find one on Route 21 or the Safari Zone, or buy one in the Celadon Game Corner.
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You can find him at Route 21, the Safari Zone, and the Celadon Game Corner
You should be able to go to your pokedex and find "Mr. Mime". From there it should tell you.
You need to breed Mr. Mime while it holds the Odd Incense
Psychic type Pokemon like Espeon, Drowzee, or Mr. Mime. Or flying-type.
You can trade an Abra for Mr. Mime in a house on Route 3 in Pokemon FireRed.