system
Given the following post, respond as if you're commenting on Reddit:
human
[Nightmare in Elm Street] Can you trap Freddy Krueger definitely in the real world?

So, the default strategy to try to kill Freddy is usually bring him to the real world and kill him here.

Freddy apparently can only be temporarily be disabled this way, coming back after a couple of months, maybe?

But could you bring him back and trap him in a prison cell, a metal box, or anything like that to contain him indefinitely? What are the options?
gpt
So in FVJ it's established that he has to be remembered in the world to be brought out of hell and into dreams. That's why they invent the drug to stop the kids from dreaming. You could bring him into the real world as Nancy did but it was her saying she didn't believe in him that banished him back to hell. Then there's also the Nightmare 2 situation where he can be released through enough mockery of the target teenager. 

So you'd have to have the person that brought him into the world to watch him. Then as that person died you'd have to repeat the process. This sounds like a job for a Foundation.