The Hydrus Coin can be found in the Upstream section of the Cortica River before you even swim into Spirit Falls. It's at co-ordinates B-3 and its "Shine Spot" is to the West as you swim upstream, almost on the "wall" of the river, and the Shine Spot also has two blue Guppies swimming around.
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http://dbkwik.webdatacommons.org | 5 |