That doesn't really mean much, a lot of legendaries that aren't mascots have signature moves too, event Pokemon from 3rd gen on, Latios and Latias, Heatran, Regigigas, and Cresselia all have signature moves. There's several non-legendaries that have signature moves as well, the Pikachu line, the Cubone line, Delibird, Octillery, Chatot, the Zorua line, the list goes on and on.
What I meant with that was those moves were hidden in the code. All those pokémon you mentioned have immediate access to their signature moves. The Thousand moves were more like Freeze Shock and Ice Burn before B2W2... Hidden in the code as an indication there were planning something for Kyurem, which they did. And now, sure, they made forms for Zygarde too but no game with it as the mascot.
@G-Panthera: Just wanted to point out that even though GS were indeed a sequel to Red and Blue, they also made Yellow as the third game, and in Japan they even got Blue complementing Red and Green... I don't have a problem with S&M continuing from where XY left off but I would have like a third Kalos game with Zygarde as the mascot... I even had my in-game team planned for it and all that...
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