Originally Posted by Fat Deck Knight
Poison, Toxic, Leech Seed, Burn, Weather Damage, Partial Trapping Move Damage, Bide Stage, Yawn Stage, Taunt Stage, Disable Stage, Encore Stage, Magnet Rise Stage, Reflect Stage, Light Screen Stage, Telekinesis Stage.
After action effects occur after both Pokemon have completed their actions
After Gallade uses Encore, both pokemon have completed their actions, so its stage goes down. I even remember Deck Knight telling me to ref a Light Screen stage that way, saying that it was a benefit to being faster.