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.
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You have to save the man that gives out honey. But you have to deffeat galatic crunt 1 and 2, and #2 grunt dropes it.
you have to beat the snowpoint city gymleader go to the lake by it then go to the front of the galatic velstone bilding talk to the grunt in front of it and he will drop it
You are going the wrong way!
The Storage Key opens the Galactic Warehouse in Veilstone City. It is dropped by a Galactic Grunt in Veilstone City after you beat Jupiter at lake Acuity.
There is no grunt that you can give a Pokemon to in Pokemon platinum.