no only in heartgold and soulsilver versions
you cant
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.
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.
No.
legendary Pokemon are rare. Pokemon from other regions are usually rare starter Pokemon from other regions THERE ARE HUNDREDS!!!!! WE CANT NAME IT ALL!!!!!
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.
Sadly no.
because they want get out of there country
No u can't
nope
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
You can only be in the hoenn region you can travel to any other regions