Simple
5 Pokémon can have Simple: 3 as a regular Ability and 2 as a Hidden Ability.
What does Simple do?
Each stage of this Pokémon's stat modifiers acts as two stages. These doubled stages are still limited to a minimum of -6 and a maximum of 6. This Pokémon can still accumulate less than -3 or more than 3 stages of stat modifiers, even though the extra ones have no effect after doubling.
Which Pokémon have Simple? (3)
Which Pokémon have Simple as a Hidden Ability? (2)
How Abilities work · Hidden Abilities explained · Every Ability