You need to buy it with berries from the dream catalogue in your dream house.
the dream world is where you can get pokemon from different generations.
You can plainly get any Pokemon in the Dream World if your patient and to continue searching.
20
that's on Pokemon black
Usually 5 to 10 minutes
I think that in the Dream World, you get points when you do certain actions (I forgot, go to bulbapedia and type in Dream World), but I think when you reach a certain number of points, you unlock new area, meaning new Pokemon, too. I haven't done it myself, but I read it somewhere so I'm not sure.
you have to send a pokemon into the dream world using online function on your c-gear (make sure you're in a place that has wifi). you can actually play in the dream world by registering your pokemon black/white game in to the global link (you need to create a pokemon.com account first) and going to en.pokemon-gl.com and clicking on "pokemon dream world"
You go to the Pokemon website, I think
7
The dream world is a place where your Pokemon go to sleep and dream and comes true.To get the dream world you have to first make a account at Pokemon.com.Then you go game sync in your game (Black or White)and then you get to the dream world you will need Internet in your house.
Go to pokemon-gl.com, and sign up for Global Link. Then, you can connect your game to the computer and enter dream world.
Rayquaza is not available in the Dream World so it cannot be found in the Dream World. Rayquaza can only be found in the Dream World as part of a promotional event.