Zygarde Cube

The Zygarde Cube is a key item used to hold Zygarde Cells needed to change the form of Zygarde.

The Zygarde Cube is earned by completing the step of the Special Research From A to Zygarde. Once obtained, collectable Zygarde Cells start appearing while traveling on Routes. It cannot be removed from the item bag.

In-game description
''An Item in which Zygarde Cells are gathered. You can use it to change Zygarde's form. It can hold up to 250 Zygarde Cells.''

Zygarde Cells
Zygarde Cells are small, collectible items that are used to change Zygarde's form. Once the Zygarde Cube is unlocked, Zygarde Cells start appearing while traveling on Routes as green glimmers of light.