Do I need to make a patent search report when applying for invalidation of the patent of the other party?

To declare the patent of the other party invalid, it is necessary to find out the reason why the patent of the other party is invalid. You can look at the provisions mentioned in Article 65 of the Detailed Rules for the Implementation of the Patent Law, all of which are invalid reasons. As long as the patent of the other party infringes on one of them, it can be invalidated.

For design, if you can't find strong evidence to prove that the patent of the other party is not novel, creative and practical, you can apply to the Patent Office for a search report on the patent. According to the search results, the report is of great significance. If the result is favorable to you, it means a lot. I dare not say what the result will be before making a search report.