There isn't one. You can't travel to other regions in diamond and pearl like you could in the older games. If someone told you there is a code to unlock Cianwood town, don't listen to them.
No but you just have to unlock the national pokedex to unlock the pal park then migrate them from any 3rd gen Pokemon game.
there is no such code.
You can not get dark Pokemon on Pokemon diamond and pearl
There is no code.
A code for Entei...sorry but there´s no Code for a Entei in Diamond!
dialga
No. Oshawatt is not present in Pokemon Diamond.
Theres not a code for that.
if you meen a code to fuse Pokemon then no
you have to get a code.
1159854
The code is called the modifier.