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If you're talking about Young Xehanort it is explained in Dream Drop Distance. This delves into Spoiler Territory, so be forewarned: Spoiler Alert!!: Young Xehanort recieved the ability to travel through time, from himself, to be more specific, he obtained it from Xehanort's Heartless, more commonly known as Ansem, Seeker of Darkness. How did Xehanort's Heartless recieve this ability? Well, Young Xehanort explains that in order to travel through time, you must leave your body behind, well remember Xehanort's Heartless always having the brown robe? That was when he did not have a body, of course he eventually regained his body after feeding off of Riku in Kingdom Hearts I. But Xehanort's Heartless travels back through time, to give his younger self (Young Xehanort) the ability to travel and manipulate time, as a fail-safe, should Xemnas fail with the original Organization XIII, which he did. In any case, Young Xehanort also explains that you can only travel through through time if you exist at the destination, well considering the fact that there are like twenty billion incarnations of Xehanort, that certainly isn't a problem. As well as "You can only travel as per the laws of time", but I won't get into the laws of time here as that is a bit much. But we all know the basics I'm sure. All in all, that's how Young Xehanort is able to travel through time.  Timelinesplitter Chaos 14:01, November 11, 2012 (UTC)

TORIYAMA'D - TidusTehSacrificer357 03:50, November 14, 2012 (UTC)
LOL.  Timelinesplitter Chaos 13:46, November 14, 2012 (UTC)