You must use Surf. Which can be given to a water Pokemon. Go to the edge of the lake (Like your fishing) and press "A" it will say: The water is a deep blue color, would you like to surf on it? Say yes. But this will only come up if you have a water Pokemon with surf on you.
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USE SURF AND GO TO THE ISLAND IN THE MIDDLE, AND ENTER THROUGH THE DOOR.
It is under the bush in the yugugu cave
You don't. That is only in Emerald version.
Sorry not that i am aware of and i have seen just about every code out there if i find a code i will post it here under Pokemon diamond Fishing rod.
The ruin maniac is under veilstone city in the cave on the left.