This page contains Pokemon Y Unlockables for 3DS called "Zygarde Sidequest" and has been posted or updated on Oct 19, 2013 by lizzylizx. Let us know what you think of this Unlockable by thumbs voting.
Once you have beaten the Elite 4, go back to Terminus Cavern. You'll have the ability to reach the most lowest level of the cavern, which showcases a couple of uncommon items and the opportunity to catch a level 70 Zygarde.
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