Go to this file path:
/system/library/coreservices/notificationcenter.app
Right click, show package contents, delete everything. Go to activity monitor and force quit notificationcenter.app
Go back to the finder and delete notificationcenter.app
Empty trash can.
Voila!!
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I could not find OSX Mavericks folder on my file preferences. Is there a different name for it on the Mohave version?