The easiest way to catch a croagunk is to go to the Great Marsh in Pastoria City and look in the binoculars. Thanks to Serebii you have a 5% chance of finding one of them.
P.S You tap the Left/Right/Down/Up Buttons will help you find a croagunk and if u r lucky you can find a skorupi.
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pastoria great marsh ( not too hard to find )
all you have to train a croagunk to level 35
Croagunk evolves in Toxicroak at level 37. Both Croagunk and Toxicroak are poison and fighting types.
Well at the Safari Zone you should be able to find him in there somewhere..
Croagunk evolves into Toxicroak at level 37.