Porygon-Z
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Porygon-Z is a Pokémon introduced in Generation IV (Sinnoh).
It evolves from Porygon2 by trading. It is the final evolved form of Porygon.
There is a chance that Porygon-Z will be reverted into Porygon2 when exposed to a Devolution Spray KC-MK1, Devolution Spray KC-MK2, or Devolution Spray KC-MK3 or an Everstone if it was evolved through trade.