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Luka's great-grandfather is a character appearing in Pokémon the Series: Gold and Silver.
Pokémon the Series: Gold and Silver
Luka's great-grandfather was a sailor who found out that a ship was transporting goods and contained a Silver Wing. However, the boat crashed and sunk to the bottom of the sea, while nobody believed his story. However, his great-granddaughter, Luka, aided by the heroes' help, managed to get the Silver Wing from the ship.