Route 18.
Black spots will appear in water when there is a Pokemon there, the Pokemon will be less common than the others on the route
What water do you mean? There are many Pokemon related things with the word water in them
It is coming in fall 2012.
It will released in the fall of 2012
dratini and palkia are the only water-dragon pokemon
Fall 2012
it is water fall and it is in ice fall cave
In Pokemon Black & White or any other Pokemon, you can catch water type Pokemon in the sea or by using a fishing rod.
Walk across it, avoiding the dark middle. If you touch the middle, you will fall. If you run, you will fall.
They announced somewhere around Fall.
Fall 2012
by fishing or using surf