"Pokémon X" is a title based upon conjecture.
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In Sil's Eurozone citizen file, he was "numbered" as 001 in X/Y — Central Kalos. (HOMEVID: Sil and the Devil Seeds of Arodor [+]Loading...["Sil and the Devil Seeds of Arodor (home video)"])
Sil's citizen file. (HOMEVID: Sil and the Devil Seeds of Arodor [+]Loading...["Sil and the Devil Seeds of Arodor (home video)"])