How do you get to the key in Pokemon mansion?

head straight along the red carpet until you see a

stairs up. Go up and you'll be in level 2 now. From here, if you

choose to go up there will be trainer upstairs as well as some

interesting note about Mew. Anyway, from level 2, Press the switch

in the statue, so its eyes doesn't glow now. Head to the North-

western corner of the room, and take the stairs to level three.

Here, press the switch on the statue again. Go down, and you supposed

to see a scientist there. In any case, go through him and drop down

though the largest column. You'll find yourself in another section

of the first floor. Beat the trainer, and continue walking along

the room until you see a stairs down. Take the stairs, and you'll

end up in the basement of Cinnabar Mansion. From here, go to the room

on your left. There will be another switch here. Turned it on and

head back to the stairs. From the stairs, head North to the now

unlocked room. From here, head north until you see another statue.

Turn the switch on and head to your left. You should see a room

with some plants and an item on the center. Take the item, and

you'll find that it's the gym key.