"MacBook Pro Screen Flickering without any physical intact: I was using Mac and it worked fine for 5-6 days but one morning I started it and 10 minutes it was working fine. But suddenly screen at bottom started flickering which was very much annoying and it shows that how Apple delivers its bad quality products. It is something which is getting in every 5th mac device, lot of articles for the same and people are getting frustrated due to that."
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A Flickering Mac Screen:
If it is flickering on its own on the bottom, then maybe it cannot keep up with itself (power wise). So, look into a new charger. If you are using a keyboard or screen cover, then that can lead to condensation leaks.
A Few Other Thoughts:
A. External Monitor:
Try an external monitor. If you get this occurrence, then it is something configured in the macOS. If not, then it is the Screen itself.
B. New Admin User:
For Troubleshooting Purposes: Try creating a new administrator user. If you don't get this error, then it is something configured in this current user. Once no longer needed, just delete the new user.
C. Boot Into Safe Mode:
In Safe Mode, Login Items do not run upon Login, particular System Preferences are set aside, and damaged system files (i.e. caches) are fixed. So, see if it then happens. After a few minutes, if it does not happen, then reboot normally, and login to the dame user giving you this issue. See if it has then been fixed.