It is for transferring Pokemon from the GBA games to diamond/pearl/platinum. They will appear in the grass and you have to catch them with Pal Park Balls
There is no secret garden in palpark. yes you get arceus there
South of Sandgem Town
IN POKEMON DIAMOND TO ENTER INTO PALPARK,FIRST YOU NEED TO FINISH SINOH POKEDEX AND FLY TO SANDGEM TOWN THERE DOWN WILL BE WATER SURF ON IT AND GO STRAIGHT DOWNWARDS AND THEN YOU WILL FIND A PASSAGE TOWARDS RIGHT GO THERE AND YOU WILL BE IN PALPARK ISLAND AND THEN IT IS EASIY TO SEARCH FOR PALPARK AFTER THIS AND ONE MORE THING YOU CAN GO TO THE ISLAND BEFORE FINISHING THE POKEDEX BUT YOU WILL NOT BE ABLE TO ENTER IT.
palpark
You have to transfer it from palpark.
cheese
any of the Pokemon you migrated
Migrate some Pokemon and go in
no. technically you can't trade from LG to DP but you can put the LG Pokemon in the PalPark how do you put Pokemon green in palpark
palpark mountain parts
palpark is only in diamond
in fuchsia city