A motion to strike a complaint or cross-complaint must be brought within thirty (30) days of service of summons. CCP § 412.20 (a)(3).This HowTo Guide addresses the steps for filing and serving motions in general civil cases in Contra Costa County Superior Court. A responsive pleading to a complaint or cross-complaint must be filed and served within thirty (30) days of service of the complaint or cross-complaint. Motion to Strike (the complaint is unclear; does not follow the law, "doesn't matter", etc.); 3. This guide describes the process of making and opposing motions in a case in Sacramento County Superior Court. A motion is a paper you can file in your case. It asks the court to decide something in your case. Contra Costa County. 8. As The Rutter Guide also explains that: "A motion to strike can be used to attack legal conclusions in a pleading….