In Pokemon Diamond, how do I open up the wall painting in Mt. Coronet?

Or is there another way to get to the peak?In Pokemon Diamond, how do I open up the wall painting in Mt. Coronet?
Yes,go to Hearthrome City and go left and find Mt.Coronet from there.In Pokemon Diamond, how do I open up the wall painting in Mt. Coronet?
u get the charizard dude to burn it down