I've discussed this with a few people, and they all agreed for this. It's a bit of work on the programmers' part, however it would be hugely useful for discussions.
It would be awesome if there was a command that displayed usage stats for the past month or two for a certain pokemon in a specific tier. An example would be /usage, Ninetails, OU if I wanted to view the usage of ninetails in OU. Or, I could do /usage, Nidoking, UU if I wanted to view the usage of Nidoking in UU.
I realize that this may be a lot of work for programmers to constantly update the usage, but a lot of people do agree that having this command available would definitely help during chat and battles.