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HS: Key to the tunnel under Goldenrod City. Gen III: Key to New Mauville.
Source: PokeAPI
In-game description
"A key that opens a door in the Goldenrod Tunnel."
HS: Key to the tunnel under Goldenrod City. Gen III: Key to New Mauville.
Source: PokeAPI
"A key that opens a door in the Goldenrod Tunnel."