you can't.
Truly I dont think you can get it in Diamond or Pearl version sorry.
Use your dowsing machine around Lake valor and you should find it neartwo homes
The Suite Key is northwest in front of the entrance to the beach of Route 213. You will need to use the Dowsing Machine Poketch App to find it.
In Pokemon Diamond you can see a girl painted like a Pokemon on the dock west of Hearthome City.
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.
use your invisible item ditecter on your poketech behind the suit area main building(where you are able to heal your pokemon) and then give it to the lady
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