you you your ap dowser
you look for it
you have to cheat
you have to get a Pokemon to level 100 then talk to porfessor oakit has to be a special event
u need to have a membership pass (to get u need A R)
Use your itemfinder thingie on your poketch near outside the front desk.
Rogues' Harbor Inn was created in 1842.
There is a guy who asks you to nap at the harbor inn outside there is a stair case that above it has a pool and a lady who says she likes the pool better because the sea is like her sweat the key is 2 steps under the stair case (Hidden Item)
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
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.
its a mystery gift you will get something called a members card letting you go in to the inn but you need to have the national pokedex and have seen cressilia on fullmoon island
The Members Card is a key event item needed to unlock the Harbor Inn in Canalave City. Inside the Inn is a NPC who will take you to Newmoon Island when you interact with them.
the answer to this question is to get out of your mums basement, get a job and stop posting questions about Pokemon :D