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You can't catch any of Slowking's line in Hoenn. You must trade it from LG.
Have your Slowpoke hold a King's Rock, then trade it with a friend to get a Slowking.
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.
slowpoke to slowking poliwhirl to politoed
king's rock evolves poliwhirl into politoed and slowpoke into slowking when they are traded