you have to go to the pal park in route 221 then from there you can catch the Pokemon that you migrated for you gameboy game.
I believe you can can find an UpGrade(used for evolving Porygon into Porygon2) in the Eterna City Hideout.
There are some Kanto Pokemon you can find in the wild like Magikarp, Geodude (breaking rocks), Zubat, Golbat, Sandshrew, etc. Other than that, you'll HAVE to migrate from LeafGreen or FireRed.
An upgrade is the item you nedd Porygon to hold. Trade it, and it will evolve to Porygon-2. Afterwards, the Dubious Disc is used for evolving Porygon-2 to Porygon-Z in the same way.
Go to Sandgem Town and Proffesor Rowan will upgrade your pokedex if you beat the Elite Four.
you have to get a porygon, then trade it with an upgrade, then you have to trade porygon2 with a dubious disc, which is found in the team galactic headquarters in veilstone city.
You have to finish the Sinnoh 'Dex, then you go to the Professor guy and he will upgrade to National 'Dex. Then you can do the Pal Park.
the upgrade is used to evolve porygon into porygon-z
yes
upgrade advisor
You will need a DS with a GBA slot (since not all of them were manufactured with one the regular, lite, and xl versions have them). You must place in the hall of fame which you need to beat the elite four and champion to do this then you must record 150 species of pokemon that appear throughout the Sinnoh region (this includes none Sinnoh pokemon). Once this is done speak to Prof Rowan and you will get a National Pokedex upgrade. Now next is Firered you must have a completed game (hall of fame done, ruby and sapphire given to Celio, National pokedex upgrade needed) and insert the cartridge in the DS and on Diamond click on Migrate *right under Continue and New Game* now remember your game must be saved in a pokemon center and the pokemon you want to migrate must be in the PC not the party. Migrate the pokemon and then go to the Pal Park talk to the guy he will let you in then run into the grass to find all the pokemon *if any of the pokemon are water types you may need to fish/surf in the water*.
cancalave city
Silph Co.
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Pokemon Tower. Why?You have to beat the Trainers Tower and the guy on the roof top will give you Upgrade.
Get a porygon 2 make it hold the upgrade and then trade. -Hope I Helped!
You have to buy Pokemon Platinum. (Its a separate game!)
You get it from professor oak it allows one rare Pokemon to evolve. And the answer before this was the real life type of upgrade :P