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This article is incomplete. Please feel free to edit this article to add missing information and complete it. Reason: movelist, for starters; needs menu sprite for Shadow Mewtwo as well; History/role in the story should be better elaborated; screenshots; VA info.
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In the past, Anne was almost possessed by a Shadow Synergy Stone but was saved by Mewtwo, whom the Shadow Synergy Stone took control of and merged with instead. Under the influence of the Shadow Synergy Stone, Shadow Mewtwo traveled around Ferrum, draining Gaia power from the normal Synergy Stones and continually increasing its own power. Shadow Mewtwo is eventually defeated in battle by the player, after which Anne uses the power of the Synergy Stone contained in her brooch to separate the Shadow Synergy Stone from Mewtwo and restore it to normal.