Generally speaking, you need to make a patent evaluation report before you prepare to sue others for infringement. On the one hand, it can determine the stability of the patent and avoid the loss of later litigation, on the other hand, it can speed up the trial process of the court.
The evaluation report issued by the National Bureau is meaningless.
For supplementary questions:
The invalidation procedure of patent right can only be started upon request, and you will not start the invalidation procedure when you make the evaluation report. If the result of the evaluation report is bad, you can hide it and don't bid farewell to the infringement. Just play with the patent certificate.