"im pretty sure its on moubtain lion or whatever."
Well, it is included with Mountain Lion, but not with whatever.
In a Finder window, select "Applications" directory. Then hold the "command" key as you press the 3 key. Now you have an alphabetical list. You will find Messages in the middle as you scroll down. It cannot get trashed, because you would see a message like the one below if you even try to trash it.
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https://www.flickr.com/photos/36589940@N04/22599762000/in/dateposted/