Gastro Acid is a Poison-type move with no power and 100% accuracy. Instead of dealing damage, it nullifies the target's Ability, making it ineffective until the target switches out or the battle ends. This move can disrupt strategies that rely heavily on specific Abilities, making it a valuable tool in competitive play. Gastro Acid does not affect targets with the Multitype or Stance Change Abilities. Introduced in Generation IV, Gastro Acid adds a layer of strategy, particularly against Pokémon with powerful or key Abilities.