You need the Member's card (For Darkrai). Get the National Dex after you beat the Elite Four including Cynthia. When you do beat Cynthia, you automatically go home and your Mum will say Barry or what ever you called your friend was looking for you. After all that things go to the Harbour Inn and a creepy guy will say "Come in" and then you sleep and appear on this creepy island.
The Harbor Inn in Pokemon Diamond is only accessible by using the Member Card. This item is only obtainable through an official Nintendo event.
practice on spelling for darkai diamond
BECAUSE THE BOY HAS NIGHTMARES
You have to get the membership pass.
you need a mystery gift
You could have only gotten a Mystery Gift through Nintendo in order to access the Harbor Inn in Canalave City in Pokémon Diamond however the key that's needed in order to gain access to the Harbor Inn, the Member's Card, it was never released for Pokémon Diamond so the only way for you to get the Member's Card is to use a cheating device such as an Action Replay or Pokésav.
The Harbor Inn in Canalave City from the Pokemon generation four games can only be opened with the Member Card. This item can only be obtained through an official Nintendo event.
Rogues' Harbor Inn was created in 1842.
member card event
At the harbor inn at canalave city. You need a member pass which you can only get through a Nintendo event
In oreder for the door open from the harbor in you have to geet a mystery present from Nintendo wi-fi.Nintendo gives you a key to open up the door
Do you have the national dex?