What information do I need to submit to apply for invalid patent of others?

Hello! If the patent application is invalid, it must be handled in China National Intellectual Property Administration. This bureau has an office in Wu Hanyou, just on Guangba Road, Wuchang. It is complicated to apply for invalidation of a patent for invention, which should generally be entrusted to the patent office, because lawyers and patent agents are two different concepts. I have dealt with invalid cases of appearance patents, but I dare not take over invalid invention patents.