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The name currently in use is a fan designator; see below for more information.
Robert's grandfather (Japanese: ロバートの祖父 Robert's grandfather) is a character of the day who appeared during Robert's flashbacks in The Four Seasons of Sawsbuck!.
He was a Pokémon photographer who traveled around the world. His grandson Robert admired his grandfather's works, particularly a photo of all four seasonal forms of Sawsbuck in one place. After showing Ash and his friends his grandfather's album, they agreed to help Robert replicate the rare snapshot.