u cant unless..... you use GameShark or somthing like that but its likely to muk up your 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.
walk
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
you can only go to kanto and johto
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.
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 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 cannot go to any other regions in Pokémon Black.
No, but you can find Pokemon's from other regions
No. If you want to go to other regions you must buy other Pokemon games.
NO
walk
You can find Pokemon from the Heonn Region and after you beat the elite four and go to Professor Birch for your Pokedex update, you can find Pokemon from different regions in the earlier games.
after Pokemon league go to safari zone, go up then right and youl be in an area were thers only Pokemon from different regions/aipom,houndor etc.....
you cant my friend