PokéBase - Pokémon Q&A
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Generation IV
When using a move, Rivalry raises the power of the move by 25% if the target and the Pokémon with this Ability have the same gender, but reduces base power by 25% if the target and the Pokémon with this Ability have opposite genders.

Rivalry reduces base power when a Pokemon with Rivalry uses an attack on a Pokemon with the opposite gender in all generations, not just Gen 7.

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