You cannot get the Member Card in gameplay. You get it through a event. But the Member Card Event is no longer available. If you have the Member Card, you can catch Darkrai.
Do you have the national dex?
if you mean the harbor inn you need a special pass obtained through a Nintendo event. p.s It gets you darkrai.
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.
no
The Harbor Key doesn't exist as an item in the Pokemon games. There is a key event item related to a Harbor called the Member Card. The Member Card is an event item needed in Pokemon Platinum to access the Island containing Darkrai. It is currently not possible to legitimately obtain the Member Card as the events distributing it are no longer held for Pokemon Platinum. The only way to get the Member Card is to use a cheat device.
In harbor inn
Action replay
you you your ap dowser
you need a mystery gift
you look for it
you have to cheat
To get inside the Harbor Inn on Pokemon Platinum you need the Member Card key event item. It is currently not possible to obtain the Member Card as the distribution events are no longer being held. The only way to get the Member Card is via a cheat device. The Harbor Inn has a NPC that can take you to the Island that houses the Pokemon Darkrai.
You can only get in the Inn with the Member's Card which is a key item that is an event item. Only Nintendo can give out the event items. They're not available anywhere in-game. unless you cheat with an ar
Go to www.pokemonplatinum.com and click mystery key
A 'Membership Card' is needed. The 'Membership Card' is one of the four key event items available in Pokemon Platinum. It is only obtainable through a Nintendo Event. Before the player may enter the Harbor Inn using the Member Card, the player must first meet Cresselia, obtain the Lunar Wing, and use it to dispel the nightmares Darkrai inflicts on the sailor's son.
you have to get it in an event. it is called the members pass, and once you get it and go in the house a man will put you in a bed. once you sleep you will wake up on newmoon island, where you can catch Darkrai.
Do you have the national dex?