You have to trade it in from any other Pokemon games like Pokemon FireRed or LeafGreen and transfer it from there. Or find a friend who has Charmander and trade with your friend.
You cannot get charamander again or in another place you have to choose him as a starter.
you can't you need to transfer from firered or leafgreen
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
check your pokedex and it is only available to catch in you chose charamander as your starter pokemon.
you don't, you get it as a starter from professor oak after beating Red
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.
Not that im sure of though, but in the Battle Tower there is.
its not a Pokemon
Not really that rare... in Pokemon Diamond you can find Sunkerns on Route 204