The Simple ability doubles all stat changes and the power of critical hits. The move Simple Beam can change a Pokémon's ability to Simple.
For example, using Swords Dance would increase the Pokémon's attack by 4 stages instead of the usual 2. If Tail Whip was targeted at a Pokémon with Simple, its defense would drop 2 stages instead of 1. Critical Hits do 4× regular damage instead of 2×.
Due to the way the game calculates the stat modification, there are effectively 8 stages, so single-stage modifications can be used 4 times instead of the expected 3. However the stats do not increase past the 6th stage of 4×.
|Generation 4||The Pokémon is prone to wild stat changes.|
|Generation 5||The Pokémon is prone to wild stat changes.|
|Generation 6||The Pokémon is prone to wild stat changes.|