Use a super rod in the water in viridian city.
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You trade Poliwhirl with King's rock You trade Poliwhirl with King's rock You trade Poliwhirl with King's rock You trade Poliwhirl with King's rock
In the water
You can not catch it in leafgreen,but in firered you can.
Nowhere no hoenn Pokemon can be captured in leafgreen.
Catch 'em all