I pretty much only ever pay attention to help chat, so I cant say anything about any other chats, but for Help Chat there are two rules that I think would be very beneficial.
The first is a lift on the ban for links provided they are helpful links. The reason for this is that, sometimes, it makes more sense to link a guide. Currently, to do this we have to DM it to them, which means that anyone else with the same question doesnt get the answer they need. I have had multiple times now that I have offered someone a link to a guide, they said yes so I DM it to them, and then i get other people DMing me asking for the link.
The second is regarding unsolicited advice. Help chat currently has a lot of issues with it. All the time I see people ask questions like "how do I evolve [pokemon]?" and people say "make sure not to evolve until 95+". Or when I saw someone ask "Where is good to farm abra?" and someone decided to respond "Why? abra is trash" which is not helpful and derailed the conversation.
TY for your time!