PO has lots of usage statistics and probably a lot of replays too already. What if we could type in or pick tags from a drop down when we challenge players, they then see the tag and is part of their information when they decide to accept a challenge. The server would then , once a battle is complete, save the battle's usage data and replay along with a tag, to help out searching (search function required) for usage data and replays for a particular player base, whether it be a certain tournament (or series), testing a tier - or ladder battles, which would probably just carry a default tag. Extra functions could be having an away-type status that only accepts tournament challenges (a certain tag), a way to change or remove a tag in-battle if both users agree to it and a way for a tag to be associated with a particular ruleset.