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An Inverse Battle (Japanese: さかさバトルReverse Battle) is a Pokémon battle introduced in Pokémon X and Y. During an Inverse Battle, type matchups are reversed. This type of battle is only conducted with Psychic Inver on Route 18, who can be battled once per day.
Any type that would be resistant or immune to another type is now weak to that type instead. The Ring Target has no effect on this, as it is applied after type effectiveness is reversed; as such, since there are no immunities due to type in Inverse Battles, it has no effect.
Stealth Rock is also affected, so Pokémon take damage based on their weakness or resistance to Rock under the inverse type chart. Freeze-Dry will always hit Water types for super effective damage, even if its type is changed. Abilities such as Thick Fat and Sap Sipper that provide a type resistance or immunity still function normally.