give your slopoke a kings rock(you can find one in sevault canyon after you beat the game) do not use the kings rock on your slowpoke-just make it hold it!!! then, trade it with a friend.
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In Pokemon leafgreen, slowpoke either evolves into slowbro at Lv.37 or slowking, when you give it the item King's Rock to hold and then trade it.
Have your Slowpoke hold a King's Rock, then trade it with a friend to get a Slowking.
You can't catch any of Slowking's line in Hoenn. You must trade it from LG.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Slowbro does not evolve to Slowking in order to get a Slowking you must trade a Slowpoke to a friend while it holds the item King's Rock and after the trade is completed the Slowpoke will become a Slowking. Have your friend send the Slowking back to you in order to recieve the data on it for your pokedex.