Nebula Stones can be used to obtain a Cosmog egg.
How to find them
Nebula Stones can rarely be brought back by Pokémons on a Alola Rumbling mission.
How to use it
The Nebula Stone can be used at the Tall Grass and will allow you to find a Cosmog egg. Note: you need the Egg Radar Chip (Legend) in order to be able to use this.
- Nebula Stones are tradeable.
- Hatching a Cosmog egg will count towards your shiny chain.