Dark Magician Girl appears during the festival event, and can be dueled by the player. After the duel, she can be found behind the waterfall in the forest at any point of Part 1, and can be selected as a partner once the player gives her a Golden Eggwich. She does not otherwise participate in the Tag Force tournament.
Tag Force 2
Dark Magician Girl duels against the player in the first story event for every Tier 1 character.