a shark legendary will be awesome still
It is, and if Marshadow is truly related to Solgaleo and Lunala, it makes a nice reference to the three main layers of nature. Just to put my case on point though,
my idea isn't about representing them as embodiments of the sea, sky and land. Rather, its about how all three celestial-themed legendaries, if my theory were true, would be based on animals that correlate/specialize to one of those three layers of the material world, nothing more or less, regardless of their typing.
That said, I did some more digging for what I think Marshadow could really be, and I came up with some interesting discoveries. First off, most people are theorizing that Marshadow may be based on the planet of Mars. However, there's also the idea that Marshadow is based on the Eclipse phenomena, but as anyone knows, Mars isn't related with eclipses, nor causes them. That said, I myself think that Marshadow may be based on both the planet and the phenomena in question. How does this work you ask? Easy.
Starting off, Eclipses come in two varieties, the first being a Solar Eclipse which is caused by the moon moving into the light of the sun, blocking it. The other variant, a Lunar Eclipse is when the Moon moves into the shadow of the Earth. Now, the latter is the key here, for when a Lunar Eclipse occurs, the moon itself goes from white to blood brownish red. Planet Mars in turn, is known as the Red Planet. As such, I think Marshadow represents Mars through the Lunar Eclipse variant as the reddish moon becomes similar looking to Mars's own color, thus may be mistaken for Mars. In fact, the name "Marshadow" pretty much hints to this through its name, which is made up from the following parts.
Mar, Mars, Sha, and Shadow, - each of these words has a certain purpose and meaning in mind, and may explain why I think GF went with the name "Marshadow" in question:
Mar:
As Wulava pointed out earlier, the word "
Mar" may refer to the
Lunar Mares, or otherwise the dark shadowy spots on the moon that are mistaken for oceanic bodies, hence why they're called "Lunar Mares", with Mar being derived from the word "
Maria", which means "
Seas" in Latin. This is what originally made me think Marshadow could be Water-type. Additionally, another meaning for the word "Mar", is that its old english for meaning "to spoil" and/or "to damage", both of which are things associated with the Dark-Type.
Mars:
Represents the planet of Mars, which is often known as the Red Planet, due to its reddish-brown color.
Mars as a planet, in mythology, is often associated with
Mars, the Roman God of War, but this can also include
Nergal, the babylonian god of war, fire and destruction. This fits because in Chinese mythology, Mars is associated with the element of Fire. Closing off, however, is that Mars, as the Red Planet, looks pretty similar to the Lunar Eclipse in appearance, which makes the moon look reddish as the Red Planet itself, being mistaken for Mars.
Sha:
The word "
Sha" on its own may not mean much, and indeed it doesn't. However, being curious myself, I looked it up anyways, and discovered that the word is Chinese for meaning "
Shark". It is what made me think that Marshadow's design, if its indeed related to the other two titular Legendaries, may/could be based on a aquatic creature, that being the shark, thus completing the
Land/Sky/Sea Creature Design theme of the Legendaries. While I, at first, thought this could justify a Water-type, this doesn't have to be the case, nor do I longer think its the case of such. That said, however, this whole part of the word may be a stretch on its own, so take it as how you will.
Shadow:
The term "Shadow" relates to darkened areas that aren't reached by light, yet are caused by it at the same time, the darkened areas providing shelter from the light. This may refer to the Lunar Mares on the moon, a.k.a the dark spots on the celestial object's surface. In full effect, however, it also represent the darkness provided by the eclipse phenomena, mainly the Solar Eclipse, where it appears the sun gets blotted out by the moon, turning it black from a visual standpoint.
Verdict:
Putting all of these pieces together, my final guess is that Marshadow represents both Mars, as well the Lunar Mares of the moon, as well both varieties of the Eclipse phenomena. For a animal design theme, I'm putting my bets on the idea that Marshadow is going to be Shark inspired, based on
Kamohoaii, the Shark Deity of Hawaiian mythology. Finally, for exact typing, I'd put my final guess that Marshadow will be Psychic/Dark, with the Psychic type being there to match its celestial theme with Solgaleo and Lunala respectively. That said, however, as it has been noted that Marshadow is rumored to have a
unique typing, its possible that
maybe Marshadow could be the first
Triple Type, which is pretty unique Legendary wise. If so, perhaps Marshadow's type could be "
Psychic/Dark/Fire" type, seeing as many people before me speculated a Dark/Fire combination for Marshadow, but that wouldn't fit with the celestial theme unless Psychic was included as well.
Mythology role:
For mythology in Pokémon Sun/Moon lore, I can see Marshadow being venerated as some fearsome shark-like deity Pokémon that appears during any of the two eclipses, being described as the entity that brings despair and chaos whenever it appears. Like how Solgaleo and Lunala each have a unique title, Marshadow's role would gain the same thing, which in this case, it would be nicknamed fittingly as
The Beast that preys on the Heavens (the word "heaven" relates to outer space). This would fit because Marshadow would literally black out/prey on the heavens themselves by causing the eclipse phenomena, thus explaining why it may represent the Eclipse, with the Lunar Eclipse making the Moon appear like Planet Mars.
Titles:
Solgaleo - The Beast that devours the Sun
Lunala - The Beast that calls the Moon
Marshadow - The Beast that preys the Heavens (outer space)
Links:
https://en.wikipedia.org/wiki/Mars_in_culture
https://en.wikipedia.org/wiki/Mars
https://en.wikipedia.org/wiki/Eclipse
https://en.wikipedia.org/wiki/Lunar_eclipse
https://en.wikipedia.org/wiki/Kamohoalii