I been wanting to know this for years what does the item up-grade do to your Pokemon?

Question

Can you guys please tell me what it does and when I know I will be sooo happy

Answer 1

The item UP-Grade is a hold item that makes Porygon evolve into Porygon 2, but only by trading. To evolve Porygon 2, make it hold a Dubious Disc and trade.

Comments

Thank you guys for that

Answer 2

Upgrade evolves porygon to porygon2 when you trade it if it's holding it.