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follow rout 40 south until you reach an island with a whirlpool at the entrance and you've reached one of the four islands.
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.
First you must have a badge from the Mahogany Town gym leader (he uses ice types). Next you must find the HM Whirlpool. Equip Whirlpool to a Pokemon and go to one of the Whirl Islands and use the move Whirlpool on a whirlpool.
whirl islands
You use whirlpool in two main areas. When you have to take the test with the elders in the Dragon's Den, you need Whirlpool. When you want to capture Lugia, you have to use Whirlpool to get into the islands.
In the jonto
Lugia is located in the Whirlpool Islands in Johto.
Whirlpool Islands in Johto. you need the HM Whirlpool to get to it because its protected by 4 whoolpools.
you find lugia in whirl island you need surf and flash to get around but you need the HM whirlpool to get past the whirlpool at the entrance of the cave
you need hm whirlpool.
to get the legendary (lugia) you must go to the whirlpool islands and on one of the islands you will find lugia
Whirl Islands only exist in Gold, Silver, Crystal, HeartGold and SoulSilver.