Currently the only way to get Zygarde Cells in Pokemon GO is by finding them on Routes. Zygarde Cells allow you to change Zygarde's forme.
How to find Zygarde Cells in Pokemon GO
When following a route, there is a chance that a small greenish icon will spawn, when you click it you will collect a Zygarde Cell.
How to get Zygarde in Pokemon GO
You can get Zygarde by completing third step of "From A to Zygarde" Special Research - alongside Zygarde you will get a Zygarde Cube which will allow you to collect Zygarde Cells.
Using Zygarde Cells you can change Zygarde's form. To reach it's Complete Forme you will have to collect 250 Zygarde Cells.
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