Porygon evolves into Porygon2 when you trade it to any other Generation IV game (Diamond, Pearl, Platinum, Heartgold, Soulsilver) while it's holding an Up-Grade, which in Platinum you can obtain at Route 224 or in the Galactic Eterna Building next to where Jupiter stood.
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Porygon doesn't evolve at a level. You need a special item to make it evolve.
use a firestone on eevee
You must first evolve Ralts into Kirlia and then you must use a Dawn Stone to make it evolve into Gallade.
You make it become friends with you, you should get Pokemon heartgold or soulsilver
you cant... you have to make chansey evolve with high friendship. you can find chansy on rout 209 in diamond, pearl, and platinum