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.
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No they evolve after trading while holding king's rock
slowpoke to slowking poliwhirl to politoed
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.
you must trade with gold or silver in order for poliwhirl to evolve. kings rock
king's rock evolves poliwhirl into politoed and slowpoke into slowking when they are traded