Using different jinx styles is suggested because of the diverse effects. Ricochet is good for attacking the Dugbogs in that corner. The Jinx Cascade is useful when you need to dispatch an enemy that normally requires more than one shot to kill (for example, Skrewt). Triple is good for stunning them.

Harry: Friendship, Gold Stamina, Ricochet Jinx
Hermione: Friendship, Gold Stamina, Triple Jinx
Ron: Friendship, Gold Stamina, Jinx Cascade

Harry: Friendship, Bertie Botts Bean Pouch, Ricochet Jinx
Hermione: Friendship, Gold Stamina Booster, Triple Jinx
Ron: Friendship, the card that makes all beans increase stamina, Jinx Cascade