You have to migrate the pokemon so any pokemon you have in your leafgreen can be in pal park but it disappears from your leafgreen
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You cannot, the point to pal park is to get Pokemon from ruby,sapphire,emerald,leafgreen, and firered
You cannot catch bulbasaur in diamond and pearl. If you have firered or leafgreen can set 6 Pokemon free in pal park and catch them there.
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.
pal park is at kanto at fuchia city
He isn't in Pal Park, he's in Eterna City