How can I destroy the ultimate stones in the way in Nintendo Smash Bros?

I'm currently playing the story fashion of Nintendo Smash Bros Ultimate and there are stones on the block that I can destroy with any bomb. But where do I get this bomb, is it a ghost and if so which one.

Yes, you need a ghost for that, but I can't tell you exactly which one.

In any case, you will recognize when you have found it, because then the icon for inaccessible changes to outline map. 👍