Routes 225, 226, and 228 fishing fith the good rod.
I caught a Poliwhirl on route 228 Using the Super Rod.
and a poliwirl can be cought using a super rod on route 225
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I'm sorry, but you will have to trade from Pokemon LeafGreen or FireRed. There is no way to find a Poliwag in the wild in Emerald.
You can't catch a poliwag in Pokemon Sapphire. You have to trade from Pokemon Fire Red or Pokemon Leaf Green.
You'll need to trade for it.
Shiny Poliwag can be anywhere in water, but you would have a very very very little chance of finding it.
To find a Poliwag in Soul Silver, just use your old rod in the water in the Ruins of Alph. The first time I put my rod in the water, I caught one! :)