Also uh here's what a Nightime Veil does: Weather Condition: Lowers the accuracy and evasion of all Pokemon who arn't Ghost Dark or Normal. Last 5 turns unless holding a Mist Stone
New Abilites that work with it or are Related:
Night Walker: Doubles the Pokemon's speed during a Nighttime Veil. (Given to Gourgeist and Bewear)
Sleep Clause: 30% Chance to set the opponent to sleep when hit with a contact move (Wiggilytuff, Munna and Musharna)
Shadow Materialization: Summons a Nightime Veil upon entering battle. (Dusknoir and Umbreon)
Silhouette Force: Boosts the power of Normal, Ghost, and Dark type moves by 30%. (Weavile and UB Father (Male Version of Kangaskan Normal/Psychic, Hyper Mega is UB Family Reunion, will have difrent ability tho))
Spirit Veil: Boosts evasion by +2 when the Nighttime Veil is active. (Banette and Hydreigon)
(this was also in the Hyper Mega decidueye post)