You'll need to trade for a Polwhirl that is holding a King Rock.
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poliwhirl has to be traded with a kings rock to get politoed
you must trade with gold or silver in order for poliwhirl to evolve. kings rock
slowpoke to slowking poliwhirl to politoed
Trade the poliwhirl while it holds the item King's Rock then ask for the politoed back from the person you traded it to.
trade poliwhirl holding king rock item