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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.
you can only go to kanto and johto
There isn't an eevee in Pokemon Emerald. If you go to serebii.net you can find lots of other way to get eevee in the other games
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 Pokémon Emerald.
If you're a badass
You go to the safari zone after you finish the game then, if you see a new path go to the grass and you can catch Pokemon from the jhoto region
I am not certain it is possible to go to other regions in Platinum, but I don't think they are accessible simply because you could do that it in the Emerald version. The only way (in my opinion) to get to the other regions are by using Action Replay cheats.
no but you can migrate Pokemon from other regions so your pokedex gets larger
You cannot go to any other regions in Pokémon Black.
No, but you can find Pokemon's from other regions
walk
NO
No. If you want to go to other regions you must buy other Pokemon games.
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.
It is impossible to go to other regions. The only thing they added is a lot of National Dex Pokemon in the post-end routes.