Porygon-Z is a Normal type pokemon.
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It evolves Porygon into Porygonz.
give it a dubious disk and trade it
give porygon (or possibly porygon 2) dubious disc ( i think you nick it from galactic hq) and trade him.
You have to trade the Porygon 2 holding an item called "Dubious Disk" to a friend. It should evolve like any other trade-evolving Pokemon.
ground/rock type pokemon. ground/rock type pokemon are not affected by electric type moves. you should defeat ground/rock type pokemon with water type pokemon.