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Simple

Not in Pokémon ChampionsGen IV
Game

Scarlet & Violet

When one of this Pokémon's stat stages is raised or lowered, the amount is doubled.

Who has it
5 Pokémon
Showdown rating

How it works in Gen IX

Each 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.

“Doubles the effects of the Pokémon's stat changes.”

In-game text, Scarlet & Violet

Changes over time

How Simple changed from game to game, newest first.

  1. Gen VIII

    … or lowered, the amount is doubled. dropped: This Ability does not affect stat stage increases received from Z-Power effects that happen before a Status Z-Move is used.

  2. Gen VII

    … or lowered, the amount is doubled. added: This Ability does not affect stat stage increases received from Z-Power effects that happen before a Status Z-Move is used.

  3. Gen V

    Before: This Pokémon's stat stages are considered doubled during stat calculations. A stat stage cannot be considered more than 6 or less than -6.

    Now: When one of this Pokémon's stat stages is raised or lowered, the amount is doubled.

Descriptions: Pokémon Showdown’s for each generation, and PokéAPI’s notes on the changes they don’t show. Champions: Pokémon Showdown.

Good to know

Pokémon with Simple

NumelBidoofBibarel

As a hidden ability

WoobatSwoobat