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To make Poliwhirl evolve into a Poliwrath, give it a Water Stone. To make Poliwhirl evolve into a Politoad, you have to make it hold a Kings Rock and Trade it to a friend. Than make them trade it back. Poliwrath is better than Politoad because it has better Attack and better Defense. It also is part Fighting type!
Currently only two Pokemon evolve when traded while holding King's Rock. These two Pokemon are Poliwhirl and Slowpoke. Poliwhirl evolves into Politoad and Slowpoke evolves into Slowking.
A Kings Rock can be used to evolve a Slowpoke to a Slowking, a Poliwhirl to a Politoad or a Seadra to a Kingdra. Note, you have to trade these Pokemon while they are holding it to evolve them.
Poliwhirl evolves into a Poliwrath with a water stone.
you can get a poliwhirl or a poliwag and evolve to poliwhirl!! then trade poliwhirl holding a king's rock.