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.
In harbor inn
Action replay
you need a mystery gift
Do you have the national dex?
first you need to have a lv.1 staravia in slot 1 then erase all your other pokemon.
The Harbor Inn in Canalave City is part of the mission to find and catch Darkrai. Nintendo has to give out the event-only item the Member's Card and when you have it in your bag - you'll be able to go into the Inn and then you'll fall asleep in the Inn and you'll wind up on New Moon Island where Darkrai resides.
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.
Rogues' Harbor Inn was created in 1842.
You need to get the members pass over wi fi mystery gift but its to late but you can trade it with somebody else
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
A Membership Pass aka the Member's Card allows you access into the locked Harbor Inn in Canalave City. When you go into the Harbor Inn, you'll fall into a deep sleep and you'll wind up on Newmoon Island where you get a chance to battle and catch Darkrai.
if you mean the harbor inn you need a special pass obtained through a Nintendo event. p.s It gets you darkrai.