You're gonna want to
read this post I made in the ORAS stall thread because it summarizes Mega Sableye's negative impact on defensive teams well and I will reference things from the post often. I don't really have a tl;dr, sorry.
For those of you who would like to keep Mega Sableye in Overused because you think you are "supporting stall", I advise you to think about it again with an open mind. I hope that you all see that the banning of Mega Sableye will help stall as a whole playstyle, not just offense and balance. If you are truly an advocate of stall (and all playstyles for that matter), you would consider banning Mega Sableye. Don't just pass it off as Smogon trying to make stall worse; on the contrary, it would make stall better. I talk more about offense in this post though, so you should read the one I made in the stall thead regardless.
Ok, so here is my rebuttal. Here it seems to be that you are saying that with Gothitelle gone, Mega Sableye will not be much of a problem anymore. However, Gothitelle going will not change the fact that Mega Sableye is able to bounce back hazards with its ability. It doesn't fix team matchup issues. It doesn't change the restrictions that Mega Sableye puts on stall as a whole. It doesn't free up teambuilding. It doesn't change the fact that Mega Sableye is uncompetitive.
Gothitelle was used on stall to give teams better counterplay to common stallbreakers. However, this doesn't remove the restrictions placed on offense and balance teams. They are still forced to run Togekiss, Hoopa-U, Mega Heracross, etc. Yes, they may no longer have to run Shed Shell, but they still have to run them in order to beat Mega Sableye teams. At this point you may argue, "Well offense should have a good, strong stallbreaker anyways. I mean, to put one mon on a team and beat a whole
playstyle! That seems fair to me". Well, true, you may be able to beat a whole playstyle with Hoopa-U, but at the same time, this is only increasing the team matchup issue. Teams should be meant to beat other teams as a whole. My 6 mons should be able to beat your 6 mons if I am the better player and I have a decently built team. It's not my 1 mon should be able to beat your 6 mons, unless you are carrying 1 of 2 specific other mons, which I lose to (again, team matchup problems created by Mega Sableye). And yes, Mega Sableye does force offense teams to run a specific stallbreaker (keep in mind, this hurts stall teams lacking Mega Sableye even more because they are not the cause for the offensive team to be running a specified stallbreaker in the first place). Offense teams cannot normally pressure stall teams with hazards like they normally would in order to beat stall teams. As long as the offense player keeps up the momentum in his or her favor, the offense player will not need a specified stallbreaker. Instead, they can use strong attackers and break stall through smart plays and momentum. Yes, there will be quite a few offense teams running stallbreakers which you should expect to see and prepare for like Mega Gardevoir, Mega Medicham, Gengar, Mega Gyarados, and Clefable, but these mons can be prepared for with ample counterplay if you are using a well built stall team. The mons that I had listed earlier (Nasty Plot Togekiss, Hoopa-U, Rain Dance Tail Glow Manaphy, Mega Heracross are just some examples, but keep in mind there are only a few, which just adds to team matchup issues), stall has little to none counterplay against. These mons are being forced upon offense teams in order to beat Mega Sableye stall, and with Mega Sableye gone, a majority of these mons we can expect to see die out in usage because they are no longer required on offense teams in order to beat stall.
Now you may argue that I had used the point that offense cannot beat Mega Sableye without hazards unless it uses specified stallbreakers that we haven't seen too much before Mega Sableye came about. This point may seem weak to some of you because Mega Sableye does not prevent hazards from getting up against everything. For example, Stallbreaker Heatran, Clefable, Swords Dance Lum Berry Garchomp, Life Orb Garchomp, and Earth Plate Landorus-T can prevent Mega Sableye from blocking hazards if predicted correctly on the switch (Clefable is the only mon that reliably keeps Mega Sableye away). However, I would argue to you that this only serves to further create team matchup issues. What you are basically saying is that if I want to play offense, I need to either run unique stallbreakers that aren't much use outside of beating stall, or run one of these Stealth Rock setters. That seems unhealthy for the metagame to me. After that you talk about how if you get Mega Sableye to a certain percentage you are able to 2HKO it on the switch in with your rock setter (keep in mind that the Mega Sableye user can just switch to Skarmory and Defog on Landorus-T and Garchomp. This seems really ironic to me because in order to get Mega Sableye down to these percentages, you need to pressure it with Stealth Rocks.
You also make a point that Mega Sableye being slow causes it to be susceptible to flinches, and use this as a point for keeping it... I mean, come on, do I even have to argue about this one? Your argument would have been stronger if you just left this out.
Ok, so I think I covered each of the points you made. Looking forward to your response. Also, I don't think I ever congratulated you for getting reqs, so grats for that.
Ban Gothitelle
Ban Mega Sableye (if you know what's good for you)