Solgaleo is the best mon.
The Alchemical Masculine; symbolized by the lion and the sun.
The musculature on his design also further alludes to the Masculine force.
Solgaleo is white in color. This is the color of Albedo. This ties into his Steel typing and weakness to Fire as well as metallurgy.
One must burn the impurity to reduce a material to Nigredo (black ash) and then further into Albedo (white ash, AKA salt).
Solgaleo's shiny color is red. This is the color of Rubedo, or the perfected material.
The tip of Solgaleo's tail is the shape of the alchemical crucible. This is the vessel that material is burned in to purify it.
The ball in Solgaleo's tail is symbolic of the Philosopher's Stone. This represents immortality.
Solgaleo's base stats are all prime numbers which are important in Platonic mathematics/philosophy.
Solgaleo's move set contains explosive and energetic abilities such as Wild Charge, Flare Blitz, Roar, and so on.
These are contrasted by Lunala's move pool which contain subtle abilities like Hypnosis, Spite, Trick, etc.
This disparity in the move pools represents the ideals of the Positive, expansive, male force (Solgaleo) and the Negative, contractive, female force (Lunala).
Solgaleo's psychic typing and the third eye that appears on its forehead are representative of higher functions of meditation, ultimately suggesting Inner Alchemy.
Inner Alchemy is a philosophical means of purifying oneself of impure ideals, habits, and falsehoods in order to perfect the Ego.
Solgaleo's ability to traverse Ultra Space and pass into other worlds is inspired by the ancient idea that one must accelerate his soul through the sun (or other stars) in order to reach the true after life or other worlds.
The red shapes on Solgaleo's mane form the kanji for Fire, alluding to its ties to the sun.
In addition to this, Solgaleo has a certain triangle on each of his feet. This particular triangle is also the Hermetic symbol for Fire.
