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Not only the announcement of Pokémon: The Origin caught people by surprise, the image of what seems to be a one-on-one fighting game appeared at the Pokémon Game Show. The people at Famitsu and 4Gamer got to see a video which ended with the image seen here. You see Blaziken and Lucario, two Pokémon who will be able to use the Mega Transformation announced some days ago, about to fight. No announcement by The Pokémon Company has been made about this.
[Source]: Famitsu: アニメ『ポケットモンスタージ・オリジン』の制作が発表！ 『ポケットモンスター赤・緑』の世界が蘇る [http://www.famitsu.com/news/201308/17038499.html].