[[File:Pokkén Shadow Mewtwo.png|thumb|230px|Shadow Mewtwo in Pokkén Tournament]]
In November 2015, a new character called Shadow Mewtwo (Japanese: '''ダークミュウツー''' ''Dark Mewtwo'') was revealed for
the [[Pokkén Tournament]], notably having the same prefix as the Shadow Pokémon in Colosseum and XD in both Japanese and English. In the past, [[Anne]] was almost possessed by a [[Synergy Stone|Shadow Synergy Stone]] , but Mewtwo saved her and the shadow synergy stone took control over Mewtwo instead. This caused it to drain power from the rest of the Synergy Stones in [[Ferrum]], continuously increasing It's power until the player, [[Nia]] and Anne defeated Mewtwo and restored it to normal.