05/08/12 - While we're still hunting down an exact answer for you, I've done a bit of research for you and found the following: Entralink only really works for a couple things. It can access the Dream World via WIFI by itself. However, to access black city (or white forest from a black cartridge) you must be visiting another person's game. This requires a few things: Whoever you are visiting must be registered in your pal pad. Whoever you are visiting must be in Wireless range NOT over wifi. (needs to be within several meters) The person you are visiting must be in the "oval" of cities (i.e. not south of Nimbasa, and not north of Opelucid) and must not be in a building or cave. So, basically when you enter the entralink and go toward the shimmering curtain on either side, it will search for another player via wireless connection. If it finds one, it will then say "now connected to _________'s world". Walk through the curtain and you will be in a black and white entralink clearing. You are now visiting the other player's cartridge. On your touch screen, you will see the map of towns. if you tap on one of them you will warp to it. tap on their Black City (just east of Nimbasa, the same place your white forest is). There you can talk to their NPCs and invite them to your forest. Courtesy of a kind John G on the interwebs. ;)