Here's my speculation.
Magiana (who I think might be Romanized as Mageana due to speculation of the name being gear and machina) is most likely a Steel/Fairy-type pokemon. Steel first due to it's mostly metallic features. Actually, I'm not sure if it would be Fairy, now thinking about it. Fairy does seem to be related to beauty, bliss, and happiness, but I can also see it being Psychic due to its sentience, or even just pure steel. I can also expect it to have a signature ability related to gears or steam powered things, but I'm leaning more towards it having some kind of -ate ability or passive ability.
My guess to what it's secret might be is maybe it's powered by a Diancie's diamond or a fairy gem due to what G-Panthera said.
My only other guesses is perhaps it happens to be steam powered, thus working perfectly with Volcanion, or it happens to be a special capture or tracking device which, when inactive, closes up by closing its head and lower half and retreating its legs and torso into the body. I feel like the red and blue lines and dots on it might be pretty important too.
My last bit of speculation about it is regarding it's generational placement. I saw a comment on youtube that explains something else. Also, for the record, they later corrected "bottom-left" to "bottom-right".
Video Source if you wish to see the comment yourself: watch?v=9VVd6WUfo8o
I agree with them that it could be a precursor, but I feel like it might just be hinting at Generation 6.5 with "Italy" being the "tail" on a shooting star. What I mean is, Kalos is shaped like a star and Italy is shaped like a swipe by a paint brush. I can't help but see GF making it the "tail" to Kalos, making it resemble a shooting star. Think of B2W2's expansion of Unova. But, at the same time, I can also see it being it's own large region with 3 large kingdoms, a Grand Duchy, States, and 3 smaller regions as well as 2 large islands. One of these islands is directly below a French island and is part of the kingdom directly connected to France. This could be like Kanto and Johto's connection.
I'm going to stop here since I'm beginning to digress, I think, and I'm also heavily distracted by... home issues. But, take this chunk of speculation and do with it as you please.