A motion to strike is a legal request made to a court to remove certain parts of the opposing party's pleadings. In California family law, motions to strike are generally filed to request the court to remove certain parts of the opposing party's pleadings.A motion to strike may be filed to strike out any irrelevant, false, or improper matter inserted in any pleading. Enter the case number using correct format and ensure case name and number match the document you are filing. Motion to strike is basically when there's something in the pleading that's false. A motion to strike can be used to attack legal conclusions in a pleading. There are special things to remember about formal Motions and oppositions to Motions:. Sample California motion to strike complaint Download as a PDF or view online for free. In the appeal the court upheld the motion to strike and the ensuing default judgment. The matter may be heard in Department 304 of the Superior Court of California, County of San.