Looking back on my speculated types for the two Legends, I thought about it more, and while I'm not yet too sure about Lunaala's typing at the moment, other than its going to include Fairy in some way (unless GF is going to troll us big time), I'm thinking of the possibility that Solgaleo of being a Fire/Steel type, which I covered in my previous theory. Why? Just look at it....that thing is super futuristic, muscular, manly, has a lot of metallic parts in its mane (definitely not organic) and the head's design, if you take away the eyes, looks like a space ship's cockpit of some kind. Also, many people around the net are joking about it being like "Liger Zero" from the Zoids series. In short, Solgaleo is a mech-like space-ship shaped like a lion.
Adding to that, Iron is a element found within the sun. In addition to that, seeing as the sun promotes life, iron only makes more sense because the said element is also vital for our bodies. In essence, as covered in my previous speculation, Solgaleo could be considered representing the "physical strength" of life.