Boosts the power of the Pokémon's moves by 25% against targets of the same gender, and lowers it by 25% against targets of the opposite gender. The power remains the same as usual if either Pokémon's gender is unknown.
Rivalry (Japanese: とうそうしんBelligerence) is an Ability introduced in Generation IV.
Effect
In battle
This Ability effect may be in need of research. Reason:Because Rivalry affects power which is calculated for all targets, does Rivalry stack when using moves that hit multiple targets? If so, how does the stacking work? You can discuss this on the talk page.
Generation IV
When a Pokémon with Rivalry uses an attack, the attack's power is raised by 25% if the target and the user have the same gender, and is reduced by 25% if the target and the user have opposite genders. Rivalry also powers up confusion damage.
In Explorers of Time, Darkness and Sky, and the Mystery Dungeon (WiiWare) games, when the attacker's gender is opposite of the target, the Attack stat is reduced by one stage, and if it's matching, it's increased by one stage.
In Gates to Infinity and Pokémon Super Mystery Dungeon, Rivalry increases the power of a move when attacking a Pokémon that shares a type. In Super Mystery Dungeon, Rivalry increases the power of a move by 20%.
