after you get the national pokedex, you need to insert a GBA game like firered or leafgreen, in the start menu, you choose migrate from GBA or migrate from "choose the color of the game (leafgreen, firered, ruby,...)". Then you choose six Pokemon from the GBA game, you'll transfer them to platinum. Carrying these Pokemon, you'll be able to enter pal park and catch Pokemon in various locations.
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To get your emerald Pokemon to platinum you transfer them in pal park.
Pal Park is in the same place as it was in Diamond and Pearl. At the end of Route 221. If you go south from Sandgem Town, and surf all the way to the right, you'll get to Pal Park.
You cant find it in platinum. Trade it from diamond or from a generation III game via pal park.
you can using cheats,trade or using pal park but without 1 of those 3 u cant
In Diamond/Pearl/Platinum you have to get the national dex before you can enter the pal park.