after you have defeated elite four, go to proffessor elm and he gives you a ticket then go to the docks in olivine city and he will let you through.
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If you're talking about the boat in Olivine City, you have to beat the Jhoto Elite Four. Then go to sea port in Olivine and Professor Oak will give you the pass and you can enter Kanto at Vermillion City.
after u defeat Pokemon lege u get ticket then fly to olivine then take the boat 2 kanto
In New Bark Town Surf on the river by your house it leads you to Indigo Plataea. The Elite 4 is located there. You should beat them and then go on the boat in Olivine. The boat takes you to Kanto. Talk to Oak and Elm. Go to the top of Mt. Silver. and defeat Red. His Pokemon are around level 88 so be prepared!
you talk to prof. Elm who gives you a S.S. ticket to get on a boat from Olivine City to go to Kanto you can only do that after you have beaten the elite 4 and Lance the champion.
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