Pick them off plants in the soil.
Migrate it.
there are 150 kinds of Pokemon that you can see and/or obtain. Unless you have friend trade you Pokemon that you can only get in pearl to you, you'll never obtain them all. In Pokemon diamond and pearl all you have to do is see the Pokemon and you get its data unlike the older versions where you have to obtain them.
darkrai and arcus
Milktank is located in route 209 and 210 in both Diamond and Pearl.
No, you do not need diamond and pearl to obtain all the Pokemon in the national pokedex. You either need to have a friend who has all the older Pokemon, or you could transfer the Pokemon yourself from older games.
IT IS NOT IN POKEMON DIAMOND OR PEARL BECAUSE IT IS ONE OF THE STARTING POKEMON IN LEAFGREEN!!!!! Migrate one from firered or leafgreen.
Bidoof usually holds berries, the are always oran berries in Platinum, so it should be the same in Pokemon Diamond and Pearl. Hope this helped:)
Bonsly is located in the trophy garden in Diamond and Pearl as well as routes 209 and 210 for Pearl.
There is only one berry house throughout the whole of Pokemon diamond/pearl but there is a flower shop where you can get free berries in floaroma town.
You must MIGRATE!!!!!!!!!!!!!!!!!!!!!!
You go to Fuego Ironworks.
He's in the Great Marsh