Eevee's much smaller body had been transformed under the influence of the moon's aura. For it to evolve, an Eevee must have full trust and friendship with its trainer during the night. Umbreon has bright yellow rings around both ears and tail, as well as on the upper parts, its front and back legs, and one in the center of its forehead. The rings glow when under the influence of moonlight.
Its physical characteristics seem to be both feline and foxlike, with a lithe thin body, cat-like eyes, a short muzzle, and a thick bushy tail. Its origins could be of black cats or foxes that are known to be nocturnal; its rings also give it an Egyptian like feel, perhaps with roots from Bastet (WereCat) or Anubis.
Umbreon evolved as a result of exposure to the moon's waves. It hides silently in darkness and waits for its foes to make a move. The rings on its body glow when it leaps to attack. When darkness falls, particularly on the night of a full moon, or when it gets excited, the rings on the body begin to glow yellow, striking fear in the hearts of anyone nearby. When agitated, this Pokémon protects itself by spraying poisonous sweat from its pores.[link]
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