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The trees are blocking an inaccessible area in Sootopolis City on Pokemon Emerald. This area was accessed with the E-Reader however the cards needed to unlock it were never released.
How do you unlock the door in the old man's house who lives on mossdeep city on Pokemon Ruby
You can't
with your foot
You must go to the hidden cavern that is located in Mossdeep. Once inside the cavern beat all the Pokémon inside and also beat Team Magma leader. Then go to the cave of origin in Sootopolis City and catch Groudon. Once you catch Groudon the gym door will unlock.
use the basement key in goldenrod city. the key is in goldenrod.
through a game shark. i have gone through it before and inside is an aurora ticket a mystic ticket and a jirachi!
The Sootopolis City Gym door is unlocked after you retrieve Rayquaza from the Sky Pillar.
Dive in front of the city. their is an opening in the dive spot. enter and go up to the surface. you are now in the city. :)
In the toliet
In the basement of the Pokemon mansion on cinnaber.
Find the key