Generation III
A Qualot Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 12 hours, with 3 hours per stage. A Qualot tree will yield 2-6 Berries.
Generation IV
A Qualot Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 32 hours, with 8 hours per stage. A Qualot tree will yield 1-5 Berries.
Generation VI
A Qualot Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 48 hours, with 8 hours per stage. A Qualot tree will yield 1-20 Berries. During its growth, watering the plant will add 0.5 Berries to the final harvest, weeding it will add 1.5, and removing a pest will add 3.
Generation VII
A Qualot Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 48 hours. A Qualot tree will yield 5-14 Berries.
Berry Blending
Berry Crushing
At 100% performance, this Berry will contribute 200 units of powder.
Poffin Cooking
At 100% performance, a Qualot Berry can produce a Level 12 (maybe higher) Spicy-Sweet Poffin when cooking alone.
Used on a Pokémon
This Berry increases a Pokémon's friendship by and lowers its Defense EVs by ten points (but not below 0). It can only be used outside of battle, and only has this effect in Pokémon Emerald and later games. In Generation IV only, this Berry reduces the EV to 100 if it was above 100 when used.