To scale walls, you will need the HM Rock Climb. To obtain it, go to Solaceon Town. Look for a a big tower and go in. Go up the stairs until you reach to the top. There will be two ladies standing there. Speak to them and one of them will give you the HM Rock Climb. Remember, you must defeat the gym leader, Candice, at the Snowpoint City gym before you are able to have one of your Pokemon use it.
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on Pokemon diamond and pearl you will need the explore kit to go underground then after mining the walls for loot there is a chance you may find a heart scale also fosils and evoloution stones
i need it for Pokemon pearl sry :(
undergruond mineing in walls
You use the explorer kit you got from the old man in eterna city to go underground and mine at the sparkling spots on the walls eventually you will dig up a heart scale
Search for them in the walls underground.