Flower Veil prevents the Pokémon with this Ability (if it is Grass-type) and its Grass-type allies (including non-adjacent allies) from having their stats lowered. Self-inflicted stat reductions, such as from Leaf Storm or Weak Armor, are not prevented. If a Grass-type Pokémon has Contrary, Flower Veil prevents the Pokémon's stats from being lowered after accounting for Contrary.
Flower Veil also prevents the Pokémon with this Ability (if it is Grass-type) and its Grass-type allies (including non-adjacent allies) from being afflicted by non-volatilestatus conditions or Yawn. However, it will not prevent a Pokémon from falling asleep if it is already drowsy from Yawn. This Ability has no effect on Rest, the Flame Orb, and the Toxic Orb.
In Pokémon Super Mystery Dungeon, any Grass-type teammates adjacent to the Pokémon with Flower Veil will not be affected with bad status conditions or have their stats lowered. Contrary to its Ability description, Flower Veil will not affect the user if it is not a Grass type.