Umbreon's evolution is the result of Eevee being exposed to the moonlight, which altered its genetic structure. Umbreon's yellow rings glow when it is excited, such as when it leaps to attack; or when exposed to the moon's aura, which fills it with a mysterious energy. Umbreon hunts at night and, as such, has well-developed eyes that can spot a prey even in darkness. Its black fur helps it blend into the night while waiting for the right moment to pounce. When it does, its rings emit a dim yet ominous glow, and it lunges for the prey's throat before eating it. Whenever angered or agitated, Umbreon sprays poisonous sweat secreted from its pores into the offender's eyes to protect itself. Umbreon primarily specializes in defensive prowess.

On a full moon day, Pikachu meets many Pokemon. The Pokemon who gather and dance also make an appearance! 

(Source: YouTube description) 

Note: Originally uploaded to Pokemon's official bilibili channel on Sept 14, 2024, then later uploaded to their official Japanese channel on Sept. 17, 2024.

Bracky