Not regions seen in other games, but you can visit some islands that are introduced in the FireRed and LeafGreen games.
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No you do not get to go to other regions in Pokemon FireRed. You will remain in the Kanto region for the majority of the game, but you will be able to go to a set of islands.
No. However you are able to visit the Sevii Islands, a pair of seven islands introduced in FireRed & LeafGreen.
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.
You can only be in the hoenn region you can travel to any other regions
Sadly no.
You must beat the seven gym leaders, the elite four, and your rival. Then you have to capture 60 Pokemon to get your Rainbow pass the will allow you to travel to Island 7 in Pokemon FireRed.
No u can't