In canalave city there is a house that is shut tightly. Why? and how to open it?

Question

Okay so I know this might be a hard to answer question but if you answer both ill give you best answer and up vote :D

Answer 1

That house is only accessable with the long-gone-by Darkrai event. IT is no longer accessable unless you use AR or some other means of hacking. ( It requires the member card)

Answer 2

That house was only accessable through an event. If you got the event ticket, you can go in, and then get Darkrai

Hope this helps!