Have your Slowpoke hold a King's Rock, then trade it with a friend to get a Slowking.
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slowpoke to slowking poliwhirl to politoed
Slowpoke into Slowbro: Level 37 Slowpoke into Slowking: Trade with King's Rock attached.
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.
what you have to do is catch a slowpoke, then find a king's rock and make your slowpoke hold it. get another copy of emerald, or ruby and Sapphire will work fine, and then trade your slowpoke, and watch it evolve into the magnificent slowking. ENJOY YOUR NEW POKEMON
king's rock evolves poliwhirl into politoed and slowpoke into slowking when they are traded