you need to beat the 4th Gym leader then chase a team galactica guy then Cynthia will give u a secret potion
You don't. its for the plot. Nothing more
there are many things you have to to befor that is broken
you went the wrong way
After you get the HM Rock Climb, and a Pokemon knows it, you can approach a rocky wall, press A, and you will scale the wall.
assuming that you are talking about guardian signs, you have to go to the past and beat the temple guardian of the temple. The Pokemon that the temple guardian uses will be the Pokemon that is on the wall. if you beat it, you can go to the wall, press the a button, and you can break it.
You use the wire and lite it on fire and the wall will go boom-boom
You need action replay to do this cheat but it is only on Pokemon pearl
In undergrounds, you have to get underground kit then, kind it in the undergrounds in wall.
Finding the Insect Plate in Pokemon Diamond requires the use of the HM Cut. It is in Eterna Forest hidden in the wall to the right of the Old Chateau.
go underground. you have to buy the digger drill and go to a wall and use it.
It's called a DIGGER DRILL and you use it by pressing A on an underground wall.
They don't really mean anything. It is just markings that have unown on the wall.