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"Robo", known as "Raremetal" (レアメタル Reametaru) in the OCG, is a series of four monsters: two Normal Monsters and two Fusion Monsters. They were first released in Legacy of Darkness. Tristan Taylor uses one of these monsters during the Virtual World arc.
The true strength of this series comes from its Fusion Monsters; once either of them is on the field, the player can continuously swap between the two of them by returning them to the Extra Deck every turn. This allows you to keep the one on the field that you need at almost any point in time.