I personally believe Gengar to be a very unhealthy and restrictive presence in the tier and advocate for its removal. Gengar was chalked up to be one of the big threats since day 1; just the meta had even stronger Pokemon like Baxcalibur, Hydreigon, and Espathra that took away the spotlight from Gengar. On the council slate last week, I voted DNB on Gengar, not because I thought it was balanced, but because I hadn’t found it problematic enough to warrant removal from the tier. However, after experimenting and playing lots with Gengar, I strongly believe it would be in the tier’s best interests to remove it soon.
To begin with, Gengar has a LOT of different sets it can run, and none are really tied to a particular archetype. Substitute + 3 Attacks, Choice Specs, Nasty Plot, Hex, and Choice Scarf are all viable and prominent within the metagame. This doesn’t make a Pokemon banworthy at all, but a closer look will especially show that Gengar’s 2 main sets, Choice Specs and Hex, can both circumvent counterplay very easily and just be incredibly difficult to deal with and you may not know what you are dealing with until it is too late on top of the other possible sets. Choice Specs mainly runs Shadow Ball, Sludge Bomb, Focus Blast, and a filler slot, usually Trick, but other moves such as Energy Ball to OHKO Gastrodon as well as Will-O-Wisp and Toxic Spikes to spread status are certainly usable. What differentiates Gengar from other choiced wallbreakers like Slither Wing, Tyranitar, and Staraptor is that its attacks are much more spammable and face little drawbacks. Shadow Ball is generally free into a lot of teams, as Ghost resists and immunities aren’t too common. Within the Great and Good tiers, which are generally the relevant Pokemon in the metagame, we see that only Grafaiai, Tyranitar, Bisharp, Iron Jugulis, Lokix, and Maushold resist or are immune to Shadow Ball. Nearly all of these Pokemon are exclusively offensive in nature and will be taking massive damage, not to mention that a well-timed Sludge Bomb or Focus Blast can put them out of commission quickly. Gengar’s only real drawback is that it is frail, but with amazing pivots like Talonflame, Slither Wing, Sandy Shocks, Slowking, and more to give it many entry chances, a well played Gengar is the scariest thing one could face. Meanwhile, even though Hex sets lack the immediate power of Choice Specs, they easily can play the longer game by using Will-O-Wisp or Toxic Spikes, sometimes even both, to punish typical switch-ins on bulky offense and balance and outlast them while wearing them down. Not only is the Tinkaton, Bisharp, or Tyranitar at risk of being muscled through or hit with Focus Blast, their longevity and offensive power is heavily hampered and allows Gengar’s other teammates to take care of them even easier. Pokemon like Tinkaton and Gastrodon shouldn’t be relegated to exclusively taking on Gengar, but they are terrified to take enough chip damage to be in range of getting blasted by Shadow Ball. Our lack of removal plays a huge part too; every calc should have at least a Spike and/or Stealth Rock because a realistic event is that these Pokemon will be compounded by residual damage as well. Let’s analyze what could be considered as counterplay from the Great and Good tiers.
Gastrodon-generally the best pivot into Gengar as it tanks Specs Shadow Ball to a decent degree and has reliable recovery. However, one well-predicted Energy Ball OHKOes Gastrodon, not to mention Hex sets do well against it. Hex takes advantage of Gastrodon being so common as Gengar counterplay by ruining its longevity and playing the long game. Will-O-Wisp blocks Leftovers and makes it burn through Recover very quickly, and while Toxic Spikes can be circumvented by a Tera Poison, it still can heavily punish Gastrodon users who may not expect this set and have to pivot into Shadow Ball to save a teammate. Tera Ghost also makes Gengar even more insane.
252 SpA Choice Specs Gengar Energy Ball vs. 252 HP / 252+ SpD Gastrodon: 480-568 (112.6 - 133.3%) -- guaranteed OHKO
252 SpA Choice Specs Gengar Shadow Ball vs. 252 HP / 252+ SpD Gastrodon: 160-190 (37.5 - 44.6%) -- 3.9% chance to 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
252 SpA Gengar Hex (130 BP) vs. 252 HP / 252+ SpD Gastrodon: 174-205 (40.8 - 48.1%) -- 66% chance to 2HKO after 1 layer of Spikes, Leftovers recovery, and burn damage
252 SpA Choice Specs Tera Ghost Gengar Shadow Ball vs. 252 HP / 252+ SpD Gastrodon: 214-254 (50.2 - 59.6%) -- guaranteed 2HKO after 1 layer of Spikes and Leftovers recovery
Grafaiai- gets 2HKOed by Sludge Bomb and has good odds to outright drop to Focus Blast.
252 SpA Choice Specs Gengar Sludge Bomb vs. 0 HP / 4 SpD Grafaiai: 144-169 (53.9 - 63.2%) -- guaranteed 2HKO
252 SpA Choice Specs Gengar Focus Blast vs. 0 HP / 4 SpD Grafaiai: 255-301 (95.5 - 112.7%) -- 75% chance to OHKO
Hippowdon- needs max spdef to remotely handle it. Hates Will-O-Wisp and Toxic Spikes more than most. Tera Ghost moment lol.
252 SpA Choice Specs Gengar Shadow Ball vs. 252 HP / 252+ SpD Hippowdon: 174-205 (41.4 - 48.8%) -- 77% chance to 2HKO after Stealth Rock, 1 layer of Spikes, and Leftovers recovery
252 SpA Gengar Hex (130 BP) vs. 252 HP / 252+ SpD Hippowdon: 187-222 (44.5 - 52.8%) -- guaranteed 2HKO after 1 layer of Spikes, Leftovers recovery, and burn damage
252 SpA Choice Specs Tera Ghost Gengar Shadow Ball vs. 252 HP / 252+ SpD Hippowdon: 232-274 (55.2 - 65.2%) -- guaranteed 2HKO after Leftovers recovery
Tinkaton- I hope you won’t have to use your Tinkaton for anything else because this Pokemon gets worn down FAST. Tinkaton often gets compressed into too many roles and can be easily overwhelmed. Shadow Ball compounds over time, while Will-O-Wisp ruins it and Hex just blows past it. Tera Ghost moment again lol.
252 SpA Choice Specs Gengar Shadow Ball vs. 252 HP / 172+ SpD Tinkaton: 147-174 (39.3 - 46.5%) -- guaranteed 3HKO after 1 layer of Spikes and Leftovers recovery
252 SpA Gengar Hex (130 BP) vs. 252 HP / 172+ SpD Tinkaton: 159-187 (42.5 - 50%) -- 91.8% chance to 2HKO after 1 layer of Spikes, Leftovers recovery, and burn damage
252 SpA Choice Specs Tera Ghost Gengar Shadow Ball vs. 252 HP / 172+ SpD Tinkaton: 196-232 (52.4 - 62%) -- 97.7% chance to 2HKO after Leftovers recovery
As for the other "counterplay", they aren’t reliable either. Tyranitar deters Gengar’s STAB attacks but gets blown away by Focus Blast and ruined by Will-O-Wisp. Not showing the calc because we all know it drops to Focus Blast barring like super specially defensive sets which are garbage. Bisharp is the same story, bonus points for being able to KO with Sucker Punch but Will-O-Wisp ruins it and Substitute + 3 attacks still is prominent enough to where you have to consider the possibility of it, creating mindgames for the Bisharp user. Also Tera Fairy exists. Iron Jugulis is slower and gets 2HKOed by Sludge Bomb. Lokix can threaten well with priority, as Banded Sucker Punch dispatches both common Tera types, but the Pokemon is very frail and won't like switching into Gengar's attacks. Moreover, Will-O-Wisp neuters it, Substitute on the Hex set itself is still a possibility to stop Sucker Punch, Gengar can just switch out and now the Lokix user is locked into an exploitable move, and in general Banded Lokix is very difficult to fit on a team. Blissey wasn’t in the Good Tier even though it’s pretty impactful but only really exists on stall which doesn’t help its case. Other offensive checks like Mimikyu, Maushold, Kilowattrel, Noivern, and Talonflame can work, but none want to switch into Gengar at all. Gengar practically has very limited defensive counterplay, but factoring in Tera Fairy to gain resists to certain attacks and circumvent offensive counterplay or Tera Ghost to give it free Adaptability, Gengar just muscles past its counterplay and can freely fire off attacks by virtue of it forcing many switches because of how strong it is.
Overall, Gengar is a very unhealthy Pokemon due to its significant strain on the teambuilder, especially for BO and balance teams, due to its set versatility and ability to beat out its “checks.” It just freely clicks buttons into the greater metagame with little around to stop it. With it gone, players no longer have to walk on eggshells to avoid getting destroyed by Specs Shadow Ball and allow their Pokemon to focus on other threats. I do concede Gengar is much easier to handle in-game, reminds me of Thundurus-Incarnate from Gen 8, but at a higher level when Gengar has all the advantages it could need, it will wreak havoc with very little to stop it as its set versatility + incredible raw power + entry hazards being even more defining is just too much. I plan to push for tiering action very soon.