From Zelda Dungeon Wiki
The Golden Rope appears in The Minish Cap as a result of Kinstone Fusion. These enemies are faster and take longer to kill than the normal Rope in the game. Link receives a large amount of Rupees as a reward for killing one.
|Appears in... Well, we're not sure! The legendary Golden Rope. It's much more aggressive than the normal ones: it will attack you on sight.|