- Argument for Appearance in Gen 6: The 6th generation of pokemon still feels rather unresolved. With the least new pokemon added to date (discounting Megas), it has always seemed like we would get more. With the announcements of new Zygarde and Greninja formes, it seemed like if there was going to be a "Pokemon Z" that the best we could hope for is new formes and megas. However, now that we have Magiana it is possible that in between the events of XY and potentially Z that a few more pokemon have been found in Kalos. It's not in the data for XY, but at this point that isn't a good argument for it not being in Gen 6. None of the ORAS primals/megas are in XY outside of Mega Blaziken, Mega Latios, and Mega Latias.
- Argument for Appearance in Gen 7: Typically, movies focus around a central mythical pokemon and then the supporting pokemon cast is either random or includes pokemon to appear in the next generation. For example, Manaphy and the Temple of the Sea is a Gen 3 movie, however the focus is around Manaphy who is a Gen 4 pokemon. It isn't the only 4th gen pokemon as Chatot also makes an appearance. It's quite possible that is what we are seeing here with the Volcanion and the Exquisite Magiana. Volcanion is the mythical pokemon and Magiana is the preview pokemon for Gen 7 (and may also be mythical). There is not a lot of precedent for introducing two mythicals in the same movie, but seeing as the online community has known about Volcanion for a while now, maybe a second mythical was added to give this movie an element of surprise. I, for one, didn't expect there to be a Gen 7 pokemon announced so it would seem like a good way to keep things fresh.
|Do you even need a pokeball to catch her?|
She seems to catch herself....
- Argument for Fusion: Ever since Black Kyurem and White Kyurem showed up, and even some before that, several pokemon have been thought to be possible fusions. In fact, before knowing how Zygarde formes worked, some suggested that Perfect Zygarde was a fusion of it and Xerneas/Yveltal. Magiana certainly takes elements from pokemon we've seen before. It's mechanical nature has similarities to pokemon like Klinklang. Its more "princess" like qualities have been likened to Diancie and Mega Gardevoir. Adding a new fusion would be interesting seeing as it would open a lot of future possibilities.
- Argument for Evolutionary Relationships: Just because Magiana is classified as "Man-Made" doesn't mean it didn't evolve from a pokemon we already have. The Klink line has always been hinted as being man-made. Juniper even mentions that Klinks showed up only 100 years ago. This might suggest there is an evolutionary relationship between them. Perhaps under certain circumstances a Klink could be reformed into a Magiana. This would make it similar to Diancie in that is a special offshoot of Carbink. The opposite is also possible. Perhaps Magiana, after being built 500 years ago, began producing its own mechanical offspring in the form of Klinks the same way Manaphy can produce Phione. This wouldn't necessarily mean it is a mythical pokemon though. In 4th gen baby pokemon were revealed that were related to 2nd gen pokemon. Perhaps if you take a Klink to a certain area and level it up it becomes Magiana? Perhaps if you breed Magiana you'll get Klinks?
- Argument for Mythical Status: The easiest argument is that is a mythical pokemon that just LOOKS like it is related to other pokemon. Maybe the gear on its head is just meant to show off it is mechanical and actually has no relation to the Klink line. This wouldn't be the first two separate pokemon have been so aesthetically similar that they were thought to be related. Luvdisc and Alomomola are prime examples. Plus, Magiana also has a pokeball aesthetic. The gear linking her to Klink isn't any stronger than the pokeball dress that COULD link her to Voltorb. Is Magiana a mutant Voltorb/Electrode? Possibly, but Foongus and Amoongus are also pokeball themed and are obviously unrelated. Also, her height (1.0 m) has being as tall as most mythical pokemon, although that's more of just a side note. It seems reasonable that Magiana is a new mythical event exclusive pokemon meant to drive up hype.
UPDATE: The English name is Magearna. Also, it has been confirmed to be a mythical pokemon.