whirl islands
The only way to do that is to get the HM06, whirlpool.
Pokemon Black and White don't have HM Whirlpool.
After you defeated Clair she will tell you to go behind the gym. She will tell you that it is the Dragon's Den. When you go their you will see a building. You will need whirlpool to get to the entrance. Clair's grandfather will ask you questions and say you are ready for the elite four.
In the ice cave after the first ice maze there is a small ice maze and at the end there is the HM for whirlpool
Find the whirlpool tm give it to totodile (if you have it)or any other water pokemon.
First, travel to Olivine City. Then, surf Southwest of Olivine to get to a Whirlpool. Then, use a Pokemon with Whirlpool to go across the whirlpool to get into the Whirl Islands.
ice path
it is in icecave near mahogany town
In the jonto
You'll need the HM Whirlpool and teach it to one of your Pokemon and you can pass the Whirlpools blocking Whirlpool Cave.
you have to get hm whirlpool
You get the HM Whirlpool from Lance after you infiltrate Team Rocket's Secret Base in Mahogony Town.
Once you find the Team Rockets lair and you beat them and you catch/defeat the Voltages Lance will give you whirlpool.
get silver wing from the old man in pewter city then go to whirlpool island go to bf3 then last go into the cave and get lugia
Well, if you have a Pokemon that knows whirlpool, you can go back to route 41 and go to the mysterious Whirlpool islands.
I gave that attack to my gyarados (dragon or water type)
You need Surf, Whirlpool , strength