You can first do that when you have beaten Team Rocket, which takes over the tower at some time.
Stairs
Walk up the stairs.
Take the stairs...
To move up one floor in a building, find the elevator or stairs in the building.
depends on where the fire is. If it's on the bottom floor, walk down the stairs and exit the building. If the fire is blocking the door, you gotta jump out the window. If the fire is on the second floor and you can get to the stairs, go to the first floor and leave but if you can't, you got to jump out the window.
You have to use the stairs to reach the last floor.
go up the stairs
From the entrance, get to the stairs and go the the second floor. Hit the switch on the Mew statue, return to the 1st floor and find your way northeast to the stairs. Take the stairs down to the basement. The Secret Key is on a table in the northwestern room in the basement.
You have to go to the second last floor. There will be a Pokemon's ghost guarding the stairs to the last floor. You will have to battle it and make it loose. It will only calm down and go away if she looses (If you have a silphscope the Pokemon will be revealed)( The ghost is a mother Marowak)
Filibuster is the term for blocking a bill for holding the floor.
By going to the stairs or falling through a pitfall trap. There is no AR code.
i don't play platimnum, but I'm sure the Pokemon games that can trade will be the top floor in the Pokemon center. if it isn't check the bottom floor. ---- how? there should be stairs at the sides of the Pokemon center. Go towards them and you'll be brought to the next floor. glad to help C: