If you mean Phione, then you have to trade for it, or get a Manaphy and breed it with a Ditto.
You can't find one! You need to breed a manaphy in the daycare with a ditto and when you get an egg in will be a phony.
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
where do i find a totodile in Pokemon diamond/pearl on nintendods
You can not find or get manaphy on Pokemon diamond but you can by hacking, trading or... if you have Pokemon ranger you have to complete the manaphy mission and then you can put it onto diamond.
You can't find a Ho-ho in Pokemon Diamond. You have to migrate.
To get a Manaphy in Pokemon Diamond you have to get Pokemon ranger and defeat it and you have to trade it to Pokemon Diamond,Platinum or Pearl.
its not a Pokemon
Not really that rare... in Pokemon Diamond you can find Sunkerns on Route 204
you have to catch all of the pokemon in diamond or SEE all of the pokemon
you can find legendary Pokemon by using your Pokemon tracker
there isn't a Pokemon ranch on Pokemon diamond, its a complete other game! there isn't a Pokemon ranch on Pokemon diamond, its a complete other game!
You can't find Steven Stone in Diamond