This was never really mentioned, so I'm going purely off of " I'm pretty sure " for this situation at the moment. I've noticed another user made a CAP pokemon team, ( A team completely made of made up pokemon ). While they did link stats, you can't actually USE the teams for anything, so I was curious as to whether or not we are technically supposed to hide them. At the moment, I see them as a variation of gimmick teams.
By this, I mean not ever going to be able to be used.