No you cannot go to other regions in Pokemon Pearl or Diamond version but in Pokemon Heart Gold and Soul Silver you can go to the Jotoh region.
Unfortunantly you cant go to other regions in Pokemon diamond and pearl. its not like leafgreen,firered,gold,silver and crystal version where you travel to different regions. You can't, Sinnoh is the only region available in the game.
It is only in HeartGold & SoulSilver and Gold & Silver you can go to different regions :/(and Crystal)
walk
you can only go to kanto and johto
No you cant catch one alone with no other game but if you have ruby insert it into the ds with Pokemon pearl and go on Pokemon pearl and go to Route 203 or Route 204 after obtaining the national pokedex. (Rudy game inserted)
there are no other regions.
You can't go to any other regions except Sinnoh.
because they want get out of there country
No.
you cant
There are no other regions accessible* other than the starting Sinnoh region. *Excluding other games.
The entirety of Pokemon Pearl and Diamond is set in the Sinnoh region. There is no way to revisit any of the other Pokemon world regions.
Unfortunantly you cant go to other regions in Pokemon diamond and pearl. its not like leafgreen,firered,gold,silver and crystal version where you travel to different regions. You can't, Sinnoh is the only region available in the game.
I think you can only be in Sinnoh, which is a shame.
no only in heartgold and soulsilver versions
You can't. Not without and not with the national dex, ou can't get to other regions at all in Pokemon Diamond and Pearl
No. If you want to go to other regions you must buy other Pokemon games.