To get a Porygon2 in Pokémon Platinum, go to Veilstone City and talk to a man in the house north of the Pokémon Center. There should be two houses; go into the house on the right and talk to the man. He will offer you a Porygon. Take it and make your Porygon hold a up-grade and trade it to evolve it into a Porygon2. Also, to make it evolve into a Porygon-Z, make a Porygon2 hold a Dubious Disk and trade it. NOTE: ITEMS WILL DISAPPEAR UPON TRADE.
In Pokemon platinum there is an ace trainer at the begining of route 216 he has a porygon2 at level 40 and two others
you have to link trade porygon
you have to have a upgrade and then trade it
It evolves porygon2 (trade)
It is impossible to obtain a Porygon2 without trading. You can get a Porygon and trade it with an Up-Grade or you can get a Porygon2 from the GTS but there is no way to get Porygon2 without trading.
you give it to porygon and trade it and it evolves into porygon2
go out of mt cornet on your way to snowpoint and go straight you see a ace trainer she has porygon2
I believe you can can find an UpGrade(used for evolving Porygon into Porygon2) in the Eterna City Hideout.
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.
Give Porygon an upgrade to hold and then trade it. Also, if you want a Porygon-Z give Porygon2 a Dubious disc to hold and then trade it.
A dubious disc is a hold item for Porygon2. If you trade a Porygon2 that's holding a dubious disc, it will evolve into Porygon-Z.
The only known Pokemon to evolve using the up-grade is porygon. It will evolve it into porygon2.