I don't think it should be banned tbh. It is a fantastic mon but it's not really broken. Unlike Magearna which was able to run a plethora of different abilities and items, M-Scizor is pretty much just limited to Flash Fire and Choice Band. It has no weaknesses with Flash Fire which is amazing, but it doesn't make it broken. I'd say it's definitely a top 3 mon in the format though along with PokeSpirit (which should be banned imo because it's a Pokestar studios "mon" which aren't even Pokemon in the first place) and Celesteela.