It is true that Ghost Type Pokemon have always been a favorite with fans - all the way back to Generation 1 when there was only Gengar, Haunter, and Gastly. Fortunately for those fans many additional Ghost Types have been added to the Pokedex as they have been discovered throughout the six Generations of
Pokemon games since then.
Now that there are so many ghosts, it makes it possible for Niantic to focus on them for a Raid Event. It is odd that they would choose to do so, of course, so soon after Gengar Day, and with the Halloween Event having happened only just before that, but as I said, Ghosts are popular, and right now Niantic is doing everything they can to keep people in the game and get them ready for the upcoming Trainer Battles.
While Ghost Pokemon dominate the list of the new Raid Bosses, they also dominate the list of possible shinies. Those include Duskull, Shinx, Shupput, Snorunt, Absol, Alolan Marowak, Gengar, Pinsir, Mawile, Sableye, and Drifloon, but you can see all of the Raid Bosses listed by tier below.
Tier 1
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Drifloon
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Shuppet
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Snorunt
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Shinx
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Buizel
Tier 2
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Sableye
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Mawile
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Sneasel
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Misdreavus
Tier 3
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Gengar
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Machamp
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Pinsir
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Sharpedo
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Scyther
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Alolan Raichu
Tier 4
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Alolan Marowak
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Houndoom
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Tyranitar
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Absol
Tier 5
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Cresselia
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Deoxys (EX Raid)
Do you have all of the Ghost Type Pokemon yet? And if not, who are you going for? Now's your chance to become a Pokemon Master!