Plaintifffiled a Motion to Strike Defendant's Motion in Opposition because it was untimely. The. A motion making any of these defenses shall be made before pleading if a further pleading is permitted.II. When a Plaintiff moves to strike an answer as untimely, the motion is treated as a motion for entry of default against the Defendant. A defendant waives the right to file a motion to strike by: ▫ Filing a responsive pleading before making the motion. (h) Untimely Motions. (i) Sanctions for Filing Frivolous Motions or Oppositions. A motion to strike must be made before a responsive pleading, if a responsive pleading is permitted. (f) MOTION TO STRIKE. The motion must be made before filing a responsive pleading and must point out the defects complained of and the details desired. (A party may file an answer within 28 days of the date the party was served with summons without seeking leave of court to do so). 1.