Surf south from Pallet town to Cinnabar Island. Once you get to Cinnabar Island keep surf west and you will eventually reach Seafoam Islands. Or Once they fix the route you can surf south from Fuschia City and you'll run into it.
You have to get eight badges and go to kanto. Then, you have to fly to either cinnabar or fuschia and then you surf right from cinnabar or go down from the Pokemon center in fuschia. keep following the route until you get there
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You can get it at Seafoam Islands or buy it with 10,000 Coins at the Goldenrod Game Corner.
On Pokemon Silver, Gold, and Crystal Blaine is on Cinnabar Island. On HeartGold and SoulSilver he is at the Seafoam Islands.
On Seafoam Islands.
cinnabar islands
You can't because there is no Pokemon Center in Seafoam Ilands.