I got it to work with object editor but since you asked for a triggered pulverize I didnt bother to post.
I used Pulverize (Neutral hostile) standard ability.
I added the ability to an item.
Finished.
I dont know why there is an issue for you guys. Perheps there is some issue with creating it as a custom ability or using the Pulverize from tauren?
Although I think using dds is much better.