Given that I am a little biased to agree with Morty on this one being that we're in the same team, but he is absolutely right. In the veteran ranks of the PokeMMO world, there are definitely teams that stand out among the rest (Aesthetics, Wailord, Bushido, VVVV, Bong, FYS just to name a few) and i think it would be some kind of crime to allow these teams' tags to be copied over. If some noob cant get in to MISC and decides to make his own team with the same tag and goes along losing to anybody and everybody he faces, draws bad publicity, or is just being stupid in general, it just hurts the original team.
To conclude, duplicate tags are bad mkay