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You can catch it at the Pastoria Great Marsh.
In the great marsh
You can find it from Great Marsh.
you have to evolve it from scorupi which you get at the great marsh You can also catch it in the great marsh but its only a 10% encounter, i suggest using the binoculars
For a Pokéner to catch a Marill to evolve into an Azumarill,search in either the Safari Zone or Mt. Mortar. The Safari Zone is easier. Marill appear at night in a certain area.