I would keep Rollout since it is already on your Geodude and if I recall correctly, those move tutors only teach it once. If you do run Rollout, my personal opinion is to give it any accuracy boosting item as it only has 90% if you manage to find Wide Lens or Zoom Lens. It gets stronger as it is used more. Wide Lens raises it by 10% from 90 to 99 while Zoom Lens will bring it by 20% from 90 to 108.