This is a tuff one (DUH!)
The way I do it is I start where Beetle comes out and I stomp the bomb under him. Then, I try to quickly push or stomp all the others that are free to move. Then, I try the ones that are near the stones and are not able to be stomped or pushed to help me. For those, I try to wait until a 'bad guy' comes hear enough and then I push it on him. You will most likely have to try several times, but it CAN be done. I do not get it everytime, even now. A lot of it is, I think, in the way they come out.
Hope this helps you.