Minus (ability)

Effect

Ups Sp. Atk if another Pokémon has Plus or Minus.

Game descriptions

Generation III	Powers up with PLUS.
Generation IV	Ups Sp. Atk if another Pokémon has Plus.
Generation V	Ups Sp. Atk if another Pokémon has Plus or Minus.

Pokemon with Minus

#	Name	2^nd ability	Hidden ability
312	Minun	—	—
599	Klink	Plus	Clear Body
600	Klang	Plus	Clear Body
601	Klinklang	Plus	Clear Body

Minus as a hidden ability

#	Name	Other abilities
309	Electrike	Lightningrod Static
310	Manectric	Lightningrod Static