Effect: When this Pokémon attacks an opponent of the same gender as itself, the move power increases by 25%. When this Pokémon attacks an opponent of the opposite gender, the move power decreases by 25%. The damage is unaltered if either Pokémon has no gender.
Completly an unrealiable ability with any doubts, or not?, in simulators Pokemon are males by default, it would be a good approach to use it, albeit unreliable anyways, but don't forget Blissey, Chansey, Latias and Cresselia among others are always females and most of legendaries, Starmie, Magneton/Magnezone, Bronzong... are always genderless.
But also good players in Pokemon usually tend to customize their pokemon, giving it a custom gender, so making it even more unreliable.
High risk, high reward without any doubts.
The best user of this Ability is without any doubts Haxorus, when this ability benefits it, it has the strongest stat Attack in the game, and even better when counting the fact that it has the move Outrage, but when this ability hinders it, it hinders it so much, reducing notably its capacity of destroying everything, at least with its absurdly base attack it does not change it as a sitting duck.
Also it has to leave the option of having Mold Breaker as ability, a piece of extract of my opinion about the drawbacks of having Rivalry over Mold Breaker:
Another pokemon with the ability with a little review:
Fraxure(Low tiers/Evolite)
Axew(LC)
Shinx(LC) (Guts is more reliable)
Luxio(eerr... OK)
Luxray(Low tiers) (Guts is more reliable)
both Nidoran(LC) (Hustle is more reliable bar the accuracy drop)
Nidorino
Nidorina
Nidoqueen ( Great movepool to abuse of Sheer Force)
Nidoking ( Great movepool to abuse of Sheer Force)
In dream world:
Beautifly ( This sucks even more with its x4 weakness to SR)
Pidove(lol)
Tranquill(err... OK)
Unfeazant
So, what do you think about?
Completly an unrealiable ability with any doubts, or not?, in simulators Pokemon are males by default, it would be a good approach to use it, albeit unreliable anyways, but don't forget Blissey, Chansey, Latias and Cresselia among others are always females and most of legendaries, Starmie, Magneton/Magnezone, Bronzong... are always genderless.
But also good players in Pokemon usually tend to customize their pokemon, giving it a custom gender, so making it even more unreliable.
High risk, high reward without any doubts.
The best user of this Ability is without any doubts Haxorus, when this ability benefits it, it has the strongest stat Attack in the game, and even better when counting the fact that it has the move Outrage, but when this ability hinders it, it hinders it so much, reducing notably its capacity of destroying everything, at least with its absurdly base attack it does not change it as a sitting duck.
Also it has to leave the option of having Mold Breaker as ability, a piece of extract of my opinion about the drawbacks of having Rivalry over Mold Breaker:
[...]Rivalry Haxorus which is too unreliable and EQ is good in OU to hit x2 these 43543454 levitators weak to Ground(notably Bronzong and Rotom-W), Unaware Quagsire is not going to stop your setup anytime soon, forget to have to hit twice to Sturdy users without SR in field or fully healed, and MultiScale Dragonite and of course, WONDER GUARD SHEDINJA lol, Outrage is an unrealiable attack since it locks in itself, and it is better to avoid it when it is possible.
Another pokemon with the ability with a little review:
Fraxure(Low tiers/Evolite)
Axew(LC)
Shinx(LC) (Guts is more reliable)
Luxio(eerr... OK)
Luxray(Low tiers) (Guts is more reliable)
both Nidoran(LC) (Hustle is more reliable bar the accuracy drop)
Nidorino
Nidorina
Nidoqueen ( Great movepool to abuse of Sheer Force)
Nidoking ( Great movepool to abuse of Sheer Force)
In dream world:
Beautifly ( This sucks even more with its x4 weakness to SR)
Pidove(lol)
Tranquill(err... OK)
Unfeazant
So, what do you think about?