Unable to Locate or update LocateDB Mac OS El Capitain, Sierra, High Sierra, Mojave!
After quite a bit of tinkering and waiting to delete my question prior to posting an uneducated question, I found an old OSXDaily article that suggests another way to update the Locate DB. The command suggested is: sudo /usr/libexec/locate.updatedb And searching for that command rather than the com.apple.locate.plist setup in launchd, I found this lovely article about changing the database update frequency. I however, took a somewhat different approach to updating the database, simply by adding a line to my daily crontab: 

env EDITOR=nano sudo crontab -e

0 12 * * * sudo /usr/libexec/locate.updatedb.

ctrl+x y [ENTER]

Thanks, I hope this helps someone going through the same annoying crap.