I really want to get darkri and to unlock the door to the inn please help me!
Sorry, Darkrai is an event Pokemon, making the Member Card an event. For current events: http://pokemondb.net/events
This event has long passed...
>The Member Card is a key event item available in Pokémon Platinum. It is only obtainable through a Nintendo Event.
>Aug. 3 to Sept. 13, 2009
Source: [Bulbapedia/ Member Card]
Not only has the event passed, but it is a Key Item, so no one can give it to a Pokemon to hold a trade to you for you to use. But maybe there will be a future event. Who Knows
So sorry bud. The member card is an event item. You can't give it to a pokemon to trade either because it is a key item. I missed that event too. If i remember... It was 3 days before my birthday which is august 6.