First you need to sign up in the POKEMON GLOBAL LINK. If you already did that make a Pokemon GO to sleep and go into the dream world. After you befriend a pokemon wake up your pokemon and then go to the entralink on your DS, DS Light, DSI, 3DS, or DSIXL. Hope this helps!! :D
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You can't, unfortunately.
Unfortunately, you can't find a wild Pikachu in Pokemon Black. To get it, you need to use PokeTransfer to transfer it from another Pokemon Game, or to find it in the Dream World, and send it to your Entralink. Hope I helped :)
you have to go to dreamworld and make a friend and send it to the entralink
you need to do this over local wireless on your' c-gear don't do it in the Pokemon center though, if your'e entering somebody else's entralink you become a multiplayer avetar of your original charicter. (spoiler) you will play as your sleeping Pokemon you will have to send Pokemon to to get the Pokemon you befriended with from the tree to entralink
Technically it's not IN the game. It is only accessible using the internet connection on the C-gear, and is to be made available after March 30th, 2011. You are supposed to register an account on Pokemon.com and then you'll be able to send your Pokemon to interact with the others sent to the net (or "put to sleep" is the term they use in game). You will be able to bring back items and Pokemon that will be found in the forest clearings accessible from Entralink. You will be given Dream Balls to capture those Pokemon there, at 100% catch rate.
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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"
it's impossible to send black and white Pokemon over to previous Pokemon games for ds. you can only send Pokemon to black and white.
If you mean entralink, then you have to be right next to a person. It is wireless only, not Wi-fi. First you need to transport to the entralink area in the middle of the Unova region. You do this by tapping on the wireless part of the device on the bottom of your screen. You will then be transported to the Entralink area. Once you have done this, You run over to one of the bridges on either side and try to move through the barrier. If you and your friend are connected, you should be able to make it through. While you are there, you can do quests. You have to talk with the old man in the middle of the main area. He will send you on quests. The more quests you do, the more energy points you get to spend on cool upgrades. Your tree in your own entralink area also starts to grow. Note: You cannot connect through Entralink if the other person is on their entralink. They also have ot be in one of the cities surrounding Entralink.
you can only send Pokemon from soul silver to black with the pokishifter
you have to send it from emerald to platnuim to black
you have to send it over from an older pokemon game