system
Given the following post, respond as if you're commenting on Reddit:
human
[DC general] How many people/organizations are there that can go toe to toe with a fully mobilized Justice League?

Obviously there are different versions, but most versions of the JL seem to have a large number of affiliate members who can be called in for various situations. What I'm wondering is who or what on earth, or in the universe, is powerful enough to give the Justice League pause when they're dealing with them? Is the Legion of Doom on the level of a peer or are they just a nuisance?
gpt
Fully assembled, the Justice League is the most powerful entity on earth. There are only a handful of entities that can defeat them; threats like Doomsday, the Anti-Monitor, Fifth Dimensional Imps, and similarly powerful threats.

There are earthly entities that can hold them at bay for a time - Lex Luthor manages to do it by himself every now and then - but never for long. The Justice League isn't just powerful, they're *resilient*. They get knocked down, but they always get back up.