|Pokédex Entry||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.|
Umbreon is one of the seven evolutions for Eevee that was new in the Johto region. Umbreon benefits from having a high defense and special defense, as opposed to the other evolutions an Eevee could undergo. Its name comes from the words "Umbra", the darkest part of a shadow, and "Eon", a long period of time (Referring to evolution).
Evolving eevee into Umbreon is broken in Pixelmon 2.5.1.
To evolve an Eevee into Umbreon you need to level up during the night with at least a happiness of 220. The speculation that it can be evolved in dark places, such as caves or underground, is false.
To make an Eevee happy you have different options: