Slash has an increased chance for inflicting Critical Hits.
Like all moves that have an increased chance for inflicting Critical Hits, Slash is a 2 step increase on the scale for chances of causing a Critical Hit.
Slash receives the flinching bonus when King's Rock is attached to the using pokémon.
Slash is affected by Brightpowder when the opposing pokémon is equipped with it.
Moves that have an increased chance for inflicting Critical Hits include: Aeroblast, Crabhammer, Cross Chop, Karate Chop, Razor Leaf, Slash.