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Reason: Japanese name.
GR Island is an island found in Pokémon Card GB2: Here Comes Team GR!. It is the home of Team Great Rocket. It contains eight GR Bases in the form of several forts, an altar, a stronghold, and the GR Castle. It also contains the Challenge Hall, a Game Center, Mr. Ishihara's Villa, and an Airport. The overall appearance of the island makes it appear to be a Rocket when viewed from the overworld.
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