Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
Hello there, I was thinking of starting a LC Theorymon thread, similar to the NU one, and I was wondering a) what would people think of that, and b) where do I post to ask permission for it?
We did have one that was never officially closed, although Mambo might not have any interest in continuing it. You'd ask one of the TLs for permission to post a new one though.
Those are the two threads. Personally I don't think a new one would be that great, but I think the ones back when we had an unbalanced meta were fun (like Dark/Ghost Yamask as a Tite answer).