Between October 26th and November 1st, Pokémon Go's Halloween special has increased the spawn rate of the following Pokémon:
- Drowzee
- Hypno
- Gastly
- Haunter
- Gengar
- Zubat
- Golbat
- Meowth
- Cubone
- Marowak
I started an incubation of a 5km egg around the same time the event started, and the egg finally hatched into a Meowth.
Before my egg hatched I incubated another 5km egg, and since Eggs are predetermined, does my egg have a higher change of hatching one of the Pokémon with an increased spawn rate or are eggs not affected by the increased spawn rate?
Best Answer
As far as I know (and confirmed by this website) the only thing that is modified is the number of candies you recieve by hatching the egg (which the range is doubled).
Hatching a Meowth during the event was just luck (or badluck depending on how you see it).
So to your question : "Are eggs affected by the Halloween event?"
Yes, by doubling the range of candies they give on hatch.