Lets say i have a folder named Pictures and I want to move or copy all files out of this folder.

However I also want to move and harvest all of the files who are in sub folders so:
Pictures/1.png
Pictures/yolo/2.png
Pictures/yolo/swag/sand/3.png
Pictures/extra/fire/4.png

I want to move or copy all these files to another folder like results so I get:
results/1.png
results/2.png
results/3.png
results/4.png

Only I have no idea in advance what sub folders will be in the Pictures folder.

How can I accomplish this in bash/shell scripts ?
I also appreciate making it file type neutral so any files are harvested from their directories (not only .png like in my example) and I have no idea what the file name will be (I only used 1...4 because i did not have any idea how to name them).