Ok so I already see one user who has posted Primeape, but I decided to go for a slightly different approach with what Pokemon I'd pair it with.
Pinsir @ Normalium Z
Ability: Moxie
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Me First
- X-Scissor
- Earthquake
- Stone Edge
Primeape @ Choice Scarf
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Close Combat
- U-turn
- Stone Edge
- Gunk Shot
Basically, any team that has a Qwilfish has to have a very solid Primeape check, because coming in and giving Primeape what is essentially a +1 boost to attack can quickly change the course of the game, especially when Qwilfish doesn't opt for a more defensive EV spread. I decided that a great partner that appreciates Qwilfish being gone is Z move Pinsir, which is able to easily snowball the team once it has been sufficiently weakened.
Pinsir @ Normalium Z
Ability: Moxie
EVs: 252 Atk / 4 Def / 252 Spe
Adamant Nature
- Me First
- X-Scissor
- Earthquake
- Stone Edge
Primeape @ Choice Scarf
Ability: Defiant
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Close Combat
- U-turn
- Stone Edge
- Gunk Shot
Basically, any team that has a Qwilfish has to have a very solid Primeape check, because coming in and giving Primeape what is essentially a +1 boost to attack can quickly change the course of the game, especially when Qwilfish doesn't opt for a more defensive EV spread. I decided that a great partner that appreciates Qwilfish being gone is Z move Pinsir, which is able to easily snowball the team once it has been sufficiently weakened.