A Pomeg Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 12 hours, with 3 hours per stage. A Pomeg tree will yield 2-6 berries.
Generation IV
A Pomeg Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 32 hours, with 8 hours per stage. A Pomeg tree will yield 1-5 berries.
Due to its ability to lower a Pokémon's EVs in HP, it is famous for the Pomeg glitch. The "Pomeg Glitch," as quoted from Glitch, states that "using a Pomeg Berry on a Pokémon with low HP may cause its HP to become a negative value."