Generations V to VII
When a Pokémon with this Ability is hit by a Bug-, Dark-, or Ghost-type damaging move, its Speed is increased by one stage. No immunity is granted to these types of moves, however.
If a Pokémon with this Ability is hit by a Bug-, Dark-, or Ghost-type multi-strike move (Pin Missile is currently the only multi-strike move of one of those types), each hit activates this Ability.
Rattled now also activates if a Pokémon with this Ability is affected by Intimidate.
Outside of battle
Rattled has no effect outside of battle.