Nebula Stones can be used to obtain a Cosmog egg.
How to find them
Nebula Stones can rarely be brought back by Pokémon on an 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.