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Looks like there is a bug with move listings relating to Zygarde-Complete. If you open the page for a move that Zygarde-Complete learns in a gen where it is available, then switch to any other generation for the move at the top of the page, the website will carry over a link for Zygarde-Complete to the new page. This appears to work with any move that Zygarde learns (below is an example showing RBY and SV Glare after switching between the two pages six times, but I also tested this with Dig and Coil with the same result). Switching from two generations where Zygarde is available (for example, from SV to SS) also produces the same bug adding more Zygardes to the top of the list.