Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
Porygon doesn't evolve at a level. You need a special item to make it evolve.
In Pokemon Platinum, Porygon-2 can evolve into Porygon-Z using the Up-Grade. I do not believe it serves any other purposes.
Try the GTS trick.
Trade it whilst its holding an Up-Grade
Just Evolve Porygon(1). And To Evolve Porygon(1),You Must Trade It.
Porygon doesn't evolve at a level. You need a special item to make it evolve.
trade while holding up grade and it will evolve into porygon 2
To evolve Porygon in Pokemon Platinum you need to trade it while it is holding the Up-Grade item. This will evolve Porygon into Porygon2. If Porygon2 is traded while holding a Dubious Disc it will evolve into Porygon-Z.
you have to have a upgrade and then trade it
In Pokemon Platinum, Porygon-2 can evolve into Porygon-Z using the Up-Grade. I do not believe it serves any other purposes.
For Porygon to evolve you have to trade it whilst it is holding an 'upgrade'. See related links for more info.
Try the GTS trick.
Trade it whilst its holding an Up-Grade
The only known Pokemon to evolve using the up-grade is porygon. It will evolve it into porygon2.
In Pokemon Platinum (I don't know about Diamond and Pearl), Porygon is located in a house directly behind the Pokemon Center. If you want to evolve into Porygon 2, trade it holding a Up-Grade, and if you want to evolve Porygon 2 into Porygon Z, trade it holding a Dubious Disk. I do not know where htese items are found. If you want to get Porygon the harder way, use Pokecheck.
Have a Porygon hold it and trade it.When the other person gets it, it will evolve into a Porygon-2.