From PokéHeroes Wiki
The Green Orb is an item which can change a Rayquaza into its mega form.
How to find them
Green Orbs can be found from opening mystery boxes.
How to use it
Giving a Rayquaza a Green Orb to hold will change it into its Mega Form.
- Green Orbs are tradeable
- You are able to remove a Green Orb from a Rayquaza to change it back to its normal form.