Generation Iv
Motor Drive
Raises Speed if hit by an Electric-type move.
Detailed Effect
Whenever an Electric-type move hits this Pokémon, its Speed rises one stage, negating any other effect on it. This ability will not take effect if this Pokémon is immune to Electric moves. Electric moves will ignore this Pokémon's Substitute. This effect includes non-damaging moves, i.e. Thunder Wave.
Pokémon With Motor Drive
4 canonical Pokémon forms can have this Ability.
Electivire 
Blitzle 
Zebstrika 
Emolga 