@Pandas795
4999 can't be "used" for anything. It acts on its own. It acts on its own.
And considering the criteria that makes one more likely to be faced by it, I wouldn't be surprised if a D-class is 4999 visit daily.
Even you can't used but it much easier to observe by leaving a near-death D-class alone in the wards and then just setup camera there and leave it until SCP-4999 show up.