Platinum only has 1 region. And that is Sinnoh
you cant
No.
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.
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.
legendary Pokemon are rare. Pokemon from other regions are usually rare starter Pokemon from other regions THERE ARE HUNDREDS!!!!! WE CANT NAME IT ALL!!!!!
no only in heartgold and soulsilver versions
I think you can only be in Sinnoh, which is a shame.
either sinnoh region Pokemon or Pokemon that are in all regions or some icluding sinnoh
nope
You can't, the only region avaible is Sinnoh.
because they want get out of there country
get national pokedex and talk to dawns sister and she will tell ufor example eterna forest slaokoathyou will catch Pokemon from different regions on diamond and pearl