Iron island the man gives it to you!
Castform can be found in the Trophy Garden in Pokémon Diamond.
The Magmarizer is a held item in the Pokemon games that helps the Pokemon Magmar evolve into Magmortar. This item can be found in Pokemon Diamond held by Magbys in the wild.
Aron can be found at Fuego Ironworks.
There is a road behind the Pokemon league where Shaymin can be found if you get Oak's letter.
drifloon which is found on fridays at Valley windworks.
yes if it is darkrai riluo or manaphey
THE POKEMON THAT ARE NOT FOUND IN DIAMOND AND PEARL ARE:MANAPHY PHIONE
Slowpoke cannot be caught in Pokemon Diamond. This Pokemon can be found on route 205 in Pokemon Pearl using the pokemon radar and traded to Diamond.
Murkrow is found in the Lost Tower, at night, and only in Pokemon Diamond.
trade from Pokemon diamond. it is only found in Pokemon diamond
Castform can be found in the Trophy Garden in Pokémon Diamond.
It is not found in the wild in Diamond; you must trade it.
Chimeco is a fourth generation Pokemon. In the game Pokemon Diamond it can be found in the wild in Sendoff Springs and at Mt. Coronet.
Snorunt can be found in Pokemon Ruby, Sapphire, Emerald, Diamond, Pearl, and Platinum.
Mukrow can be found at Eterna forest at night.
The Magmarizer is a held item in the Pokemon games that helps the Pokemon Magmar evolve into Magmortar. This item can be found in Pokemon Diamond held by Magbys in the wild.
Palkia is the legendary Pokemon in Pearl, and there is also various Pokemon found in Pearl, but not in Diamond. Diamond has some, that Pearl doesn't have.