Really late to the party regarding the mighty Hoenn's hopeless ghosts (Dusknoir and Mega Banette), but I'd like to add on to the two posts regarding the mighty Dusknoir and Mega Banette
In addition to Sableye, Cofagrigus, and Doublade, you can also use this:
Instead, Use this:
Why it's better:
Gourgeist is another viable bulky Ghost-type that can do far better than Dusclops or Dusknoir ever could. It has more overall bulk because it has far more HP than Dusclops/Dusknoir, and it has Will-O-Wisp as well as Leech Seed to be just as annoying as they are, and more. It also has reliable recovery in Synthesis, making it last far longer than Dusclops or Dusknoir ever can. Gourgeist-Super also has more offensive presence because of Seed Bomb, so it can hit stuff harder and it also hits Keldeo and Tyranitar hard, which is another reason to use it over Dusclops/Dusknoir. If you really want, Gourgeist also has Phantom Force to hit harder and bypass Protect, and can dodge attacks for one turn to be able to further accumulate Leech Seed and Will-O-Wisp damage. Leech Seed also gives Gourgeist more longevity than Dusclops/Dusknoir, as it can sap HP from the opponent and constantly give greater recovery each turn.
Adding on to this post too, there's another alternative, which, while not a Ghost-type, is a far better option for the main thing to even use Mega Banette for.
Instead, Use This:
Why it's better:
While Mega Glalie is not really that similar to Mega Banette in how it plays, it is a far more rewarding option for a Mega Slot as a suicide Mega. The main reason to even use Mega Banette in the first place is Prankster Destiny Bond to die in order to get a free kill. However, Glalie is a much better for the "die in order to get a kill" Mega Evolution, because it can wallbreak well with Refrigerate Double-Edge and EQ plus fun options like Ice Shard to revenge kill, Super Fang to halve HP, and Freeze-Dry to pester different kinda of Pokemon, in other words putting much more work against a team than Mega Banette before exploding (in other words, letting itself die to get a kill), or succumbing to Double-Edge recoil. Furthermore, unlike Mega Banette, Mega Glalie does not have to deal with mindgames of Prankster Destiny Bond and risk becoming a liability as setup fodder, as Refrigerate Explosion can be clicked and get a free kill for free. As a suicide Mega, Glalie does far better than Mega Banette and is much more worth the Mega Slot as a Pokemon whose main reason to be used is to "kill em and die!".
Just wanted to throw that in there.
Adding to that, if you really wanted a ground type spinner, Excadrill would be a better choice than Donphan. It has a better typing and generally better stats. I know Excadrill is more of a sweeper anyway, but the point still stands.
Also, I still keep seeing these, especially in low ladder games:
Don't use either of these:
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Why they're bad: Dusclops and Dusknoir look decent at first glance: high defensive stats, an immunity to a common attacking type, only two weaknesses, and able to burn things. However, that's where their good points end. Their other stats, save Dusknoir's attack, are plain awful, especially the HP stats of both, which compromises their large base defensive stats. This might be remedied if they had offensive presence, but they don't. Not even Dusknoir, whose best STAB only has 60 BP, and its coverage moves aren't that great either. They also lack good recovery; by the time they're in low enough health to need Pain Split, they're definitely outsped and likely KO'ed.
Instead, use one of these:
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Why they're better: Mega Sableye is easily the best bulky ghost mon in OU right now. Not only does it have good bulk, but arguably a better typing, Calm Mind for something resembling offensive presence, reliable recovery, and Magic Bounce, preventing stuff like Toxic, which flusters most defensive mons that are not immune to poison. If you already have a mega on your team, normal Sableye can also work, thanks to Prankster WoW/Recover/Taunt and access to Knock Off. Lastly, while it isn't exceptional, even Cofagrigus has a niche, with actual offensive presence with NastyRoom as well as Mummy to deter attackers that rely on their abilities.
Edit @ below: You can also use this:
In addition to Sableye, Cofagrigus, and Doublade, you can also use this:
Instead, Use this:

Why it's better:
Gourgeist is another viable bulky Ghost-type that can do far better than Dusclops or Dusknoir ever could. It has more overall bulk because it has far more HP than Dusclops/Dusknoir, and it has Will-O-Wisp as well as Leech Seed to be just as annoying as they are, and more. It also has reliable recovery in Synthesis, making it last far longer than Dusclops or Dusknoir ever can. Gourgeist-Super also has more offensive presence because of Seed Bomb, so it can hit stuff harder and it also hits Keldeo and Tyranitar hard, which is another reason to use it over Dusclops/Dusknoir. If you really want, Gourgeist also has Phantom Force to hit harder and bypass Protect, and can dodge attacks for one turn to be able to further accumulate Leech Seed and Will-O-Wisp damage. Leech Seed also gives Gourgeist more longevity than Dusclops/Dusknoir, as it can sap HP from the opponent and constantly give greater recovery each turn.
Don't use this:
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Mega Banette on paper seems like a very appealing Pokemon, with a massive attack stat of 165 and Prankster Will-O-Wisp and Destiny Bond. However, it falls flat on its face when in practice. It is pretty frail, has massive 4MSS, has no reliable recovery, and a psychical ghost is almost never good, with Shadow Claw being your only option. Also, Banette doesn't have Prankster before mega evolving, so this can really bite you in the bum when you need an immediate Will-O or Destiny Bond. Plus, there are better options for a Prankster Pokemon.
Instead, use these:
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Sableye is a much better option for a Prankster Pokemon, with almost every move Mega Banette gets and more. It has a better typing, reliable recovery, and it has a better mega evolution, giving it more bulk and allowing it to create mindgames with the opponent. Sure, Banette has Destiny Bond and Thunder Wave, but Thundurus is a better T-Wave spammer, and needing to rely on fainting to have some use is pretty bad tbh.
Adding on to this post too, there's another alternative, which, while not a Ghost-type, is a far better option for the main thing to even use Mega Banette for.
Instead, Use This:

Why it's better:
While Mega Glalie is not really that similar to Mega Banette in how it plays, it is a far more rewarding option for a Mega Slot as a suicide Mega. The main reason to even use Mega Banette in the first place is Prankster Destiny Bond to die in order to get a free kill. However, Glalie is a much better for the "die in order to get a kill" Mega Evolution, because it can wallbreak well with Refrigerate Double-Edge and EQ plus fun options like Ice Shard to revenge kill, Super Fang to halve HP, and Freeze-Dry to pester different kinda of Pokemon, in other words putting much more work against a team than Mega Banette before exploding (in other words, letting itself die to get a kill), or succumbing to Double-Edge recoil. Furthermore, unlike Mega Banette, Mega Glalie does not have to deal with mindgames of Prankster Destiny Bond and risk becoming a liability as setup fodder, as Refrigerate Explosion can be clicked and get a free kill for free. As a suicide Mega, Glalie does far better than Mega Banette and is much more worth the Mega Slot as a Pokemon whose main reason to be used is to "kill em and die!".
Just wanted to throw that in there.