Oshawott can't be caught in Diamond.
No. Oshawatt is not present in Pokemon Diamond.
Oshawatt is a Pokemon only available in Pokemon Black and White. There is no way to get it in Pokemon Platinum, because that Pokemon didn't exist when the game was made.
Not without trading or starting again. Find someone on the GTS.
You can't unless you picked it as starter pokemon.
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
Starters are Oshawatt Tepig and Snivy
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