As Pokemon X and Pokemon Y prepare their simultaneous worldwide release on October 12, rumors and theories have been flying regarding Nintendo's traditional third iteration of the sixth generation: Pokemon Z, and its accompanying legendary Pokemon.

As previous reported, the rumors are that in addition to being inspired by France, Game Freak is using the Norse mythology of Yggdrasil, although it is certainly not the only theory regarding X and Y.

"In Norse mythology, the Tree of the World, Yggdrasil, is located at the center of the universe and holds the nine worlds together through its roots," writes Zelda Informer contributor Colin McIsaac.

"While X, Y, and Z represent the three axes on a 3D plane, they also represent the three encompassing realms held by Yggdrasil: Asgard, Midgard, and Niflheim. Most importantly, each of the three encompassing realms is represented by a different animal."

McIsaac goes to explain that Asgard is located at the top of Yggdrasil and home to the divine eagle (Yveltal). Midgard is home to the stags with branch-shaped horns (Xerneas).

More interestingly, the roots of Yggdrasil is said to house a serpent-like dragon Niohoggr, trapped by the roots from the rest of the Yggdrasil.

Now, there are some exceptionally depicted illustrations of Niohoggr, but perhaps due to legendary Mewtwo's highly anticipated return in a new form, some Pokemon gamers have started rumors that the Pokemon Emerald legendary, Rayquaza, will be the legendary for Pokemon Z.

"The whole Red, Blue and Green just makes perfect sense. What if Rayquaza was actually their trio master? The same way Arceus had the 3 elves and 3 dragons," writes Marriland visitor AceJay1230.

"It IS possible."

Meanwhile, check out this awesome fan depiction of what the Pokemon Z legendary could look like.

With so many rumors and theories regarding this upcoming generation, it is all but decided that a third game or potential sequels will be released for X and Y at a later date.

But will any of these theories hold up? What do you think?