I fear that inexperience / lack of knowledge will derail the topic and people will fail to realize why Gengarite is actually being reviewed here. Most anti-ban arguments are centered around this one ideology - "You can't ban things from Ubers". It's already been addressed by our older tier leader, Bojangles, that Ubers isn't the place where nothing is banned, at least not any more. Due to the retesting of clauses in Generation 5, Ubers became (in Bojangles's words) "The metagame with the least amount of bans possible". This already throws out the idea that you cannot ban something from Ubers, which from my experience in reading this thread and talking to those against this suspect, is the most common argument against it. Why let an old mentality make your decisions for you? Times change, metagames change. Even Ubers is no exception, you would be a fool to think that GF would never come up with a Pokemon/Ability/Item that is just too broken that it could even be called "uncompetitive", even by our very high standards. While I think a questionable decision was made regarding testing Gengarite first and not Shadow Tag as a whole (as this now gives those against the idea that we are trying to ban a Pokemon instead of the main issue - Shadow Tag), I hope people realise that if Gengarite is banned, then Shadow Tag will be suspected right after it. You think Mega Gengar can be played around, but Gothitelle is worse? Vote to ban Gengarite, and then vote for a Shadow Tag ban when that comes after it. It really is that simple.
I also question the skill level of those that say "you can counter / play around Mega Gengar" - How in the hell do you counter something with SHADOW TAG? You don't switch into it. You just can't. Your only chance is to give it a hard time to Mega Evolve, which if all you run is purely offensive pokemon then sure, Mega Gengar has some troubles Mega Evolving, but you forget that Mega Gengar can nearly always force a 1/1 trade. I've seen a growing trend of "Thunder Wave on everything" just to try and stop Mega Gengar from taking down a vulnerable mon.
"Oh so you want to ban X because its uncompetitive? Why don't we ban Y because of *insert silly reason*"
This is also a dumb argument. Whatever you put into "insert silly reason" it usually comes down to the fact that the thing you compare it to is A) nothing like Shadow Tag (showing lack of experience really) and/or B) has checks and counters, and Shadow Tag has no checks and counters, making it a moot point. This is a very big decision, and one that will make Ubers history, so I implore you all to make rational thoughts before making a decision like this if you can get the requirements.