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Reason: "Reason: HGSS needed".
Route 20 (Japanese: 20ばんすいどう 20 Bansuiro) is an east-west route located in South-Southwest Kanto. The Seafoam Islands are located near the center of the route.
|Stardust||Hidden on the large unoccupied island near Cinnabar Island.||FRLG|
|Stardust||Hidden on the north-east corner of the long, narrow sandbar on Cinnabar's side.||HGSS|
|Deepseatooth||To the right of the entrance to Blaine's Gym. Hidden in the ocean.||HGSS|
|Deepseascale||North of Seafoam Islands near Swimmer Luis (Hidden in the ocean)||HGSS|
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|Kanto (Sevii Islands) · Johto · Hoenn · Sinnoh (Battle Zone) · Unova · Kalos · Alola · Galar|
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