The Great Marsh, is located inside the Pastoria City.
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Near the entrance of mt. Silver or at the great marsh
great marsh great marsh
There is no cave in the Great Marsh.
The Team Galactic Grunt is not in the Great Marsh, he is directly outside of the entrance building. Talk to him after you have 4 Badges and he'll run off. Chase him and keep on chasing him until he battles you then he'll run off, keep on following the path until Cynthia stops you.
There is no great marsh, but a safari zone north of Cianwood City.