There are 5 regions.
Generation I: Kanto
Generation II: Johto
Generation III: Hoenn
Generation IV: Sinnoh
Generation V: Unova
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648
there r 2 regions. sinnoh and the battle frontier
The pokemon game that has two regions is gold silver and crystal and the remakes of gold and silver heart gold, soul silver although many of the games have areas you have to take a boat to which is close to two regions but not officially a region
KantoJohtoHoennSinnohOrreFioreAlmia
you can go to all the regions. First tou have to beat the battle frontier and find this old man with a ghost Pokemon and then you go home and you will find may.and you will get to battle any were.