Firstly, I'd edit this if I could, but fill your titles with the most information as possible. Instead of 'I am tryin to find a tm?', make it 'Where is TM94 Rock Smash?'
As for your question, you can talk to a bald man in south of Virbank City, and you'll agree to defeat three workers in the Virbank Complex. Once you defeat all of them, return to the bald man to receive TM94 Rock Smash.
Hope I helped. :)
Source: Various parts of Serebii and this.