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He's the father of every single main character in all of the games. He can travel through time and shows up when any of his children are on a journey to help them, disguising himself under names such as Alder, Prof. Oak, and Cynthia. He got his time travel powers by murdering Yveltal 3000 years ago, which gave him the ability to transform into Yveltal whenever he wants.
You heard it here first. Pic Unrelated.