In Pokemon X in the Lost Hotel, what move or what do I need to do to push down the Grey bricks with cracks?

Question

In The lost hotel, I am trying to find all of the items in the southern half, yet at least 2 of them are blocked by walls, according to the guidebook I'm using to help me find all the TMs, So How do I Push them down, or what move do I need to use?

Answer 1

Rock Smash. Interact with the crack, select yes when asked if you want to break it, and you will be able to continue.

Source: Experience