Ghost-type Pokémon are one of the hardest types to find in Pokémon Go, but if you're working your way through the various Research quests for tracking down Mew, you're going to need to find them in bulk.
There are several ways you can find and catch Ghost-types, thankfully, so here on this page we'll run through each and every method for where to find Ghost-type Pokémon as well as giving you a quick Ghost-type Pokémon list of what's available, and note anything else you should bear in mind, too.
Pokémon Go Ghost-types - where to find Ghost-type Pokémon
By far the easiest way to catch Ghost-type Pokémon is by playing the game at night.
Between the hours of around 8pm and 8am local time, peaking at around 2am, Ghost-type Pokémon spawns drastically increase wherever you are, so simply playing the game out and about after dark is going to be your best chance of catching them en masse.
That said, the obvious caveat is that not everyone can, or would like to, be wandering around with their phones out after dark - but thankfully there are a couple of other ways you can rack up those Ghost-Pokémon numbers.
The next is Raids - Duskull, Sableye and Gengar are all still available in Raids at the time of writing, and Sableye in particular is still a fairly regular one to spawn.
You can also solo a Duskull or Sableye Raid, meaning you don't need to assemble a large squad of friends to help like you would with Gengar, which takes at least three or four players to tackle it comfortably.
There also the added bonus of you increasing your chances of catching a Shiny Sableye or Duskull at their Raids - and Gengar, meanwhile, is a solid competitive option and counter to a few fairly common uses in the current meta, so any of these Raids are useful outside of the fact that they're a source of Ghost-type Pokémon, too.
The downside there of course is that you can only do one Raid a day without having to buy additional Raid passes, and likewise it depends on the luck of the draw with which Raids appear where and when.
Another method is through foggy weather - the in-game weather system boosts the spawn rates of the corresponding types of Pokémon, but typically foggy weather is one of the rarest types (although this of course depends on where you live), so it's not the most reliably way to track the spooky Pokes down.
One more is via conducting certain quests for your Field Research. Completing the quest that asks you to land 3 Great Throws in a row will cause either a Gastly or an Onix to appear, and likewise the quest that asks you to catch three Poison-type Pokémon has a one in three chance of Gastly being the 'reward' Pokémon, too.
The final option is finding a Ghost-type nest. Nests, if you didn't know, are specific spots where large numbers of a certain Pokémon will appear - so you might get a lot of Bulbasaur appearing in a certain park for a period of time, for instance, until the nests change.
They rotate fairly often, so if you find one be sure to take advantage of it quickly. To find out what nests are near you, pop your location into The Silph Road's handy nest locator, here.
Looking to catch yourself some more Pokémon go tips and tricks like this? We cover everything you need to know about the new Research quests feature, as well as all you need for finding out how to unlock Mew in Pokémon Go, and we've also got some advice on where to find Ghost-type Pokémon if you're having trouble. Other current events include April's Community Day, while you can finish off your Gen 3 Pokémon collection, and learn how the new creatures changed 2km, 5km and 10km Egg charts, region exclusives, Buddy distances and Shinies. Ever-expanding Pokédex completionists, meanwhile, might want to read about the various Special Items available as well as the various methods for determining Eevee evolutions.
Pokémon Go Ghost-type Pokémon list
The other main thing it helps to know is what Ghost-type Pokémon there are in Pokémon Go at the present time. Here's a list of Ghost-types available now:
Gastly, Misdreavus, Sableye, Shuppet and Duskull are the ones you're most likely to encounter, particularly at night, with the others all second or third-stage evolutions and therefore much rarer to find in the wild.
Keep an eye out then, and do be safe if you're playing at night!