This is a rumor so don't take me for granted, behind the door is a room with a trainer that will battle you and its team aquas leader Archie and he has a missingno.
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u cant go behind it
Get a Pokemon who knows cut and use it on the door. You can't just press "A" at the door though you have to open your Pokemon menu and do it from there.
find someomne else
it is in the temple thing on the third island behind the throne. it is the key for the cave door on the second island.
Land :) xx
because the old lady is hiding something behind the door way,
Sneak out and hide behind statues go through the storage room door and you will be by the dock.
You have to have an e-reader. the e-reader game is behind them.
The Door Behind was created in 2004-10.
Behind the Trap Door was created in 1984.
Behind That Locked Door was created in 1970.