The Berry is blue on the outside, but it blackens the mouth when eaten.
Generation IV
Though this small, delicately skinned Berry is blue in color, it dyes the mouth black when eaten.
Bag description
Generation III
POKéblock ingredient. Plant in loamy soil to grow Bluk.RSE Can be ground up into powder as an ingredient for medicine.FRLG An item brought over from a faraway place.ColoXD
Generation IV
A Poffin ingredient. Bury it in soft soil to grow a Bluk Plant.DPPt In the Sinnoh region, they like to make sweets known as Poffins with this Berry and feed them to their Pokémon.HGSS
Generation V
A Berry which is very rare in the Unova region. A maniac will buy it for a high price.
Generation VI
A Berry to be used in cooking. This Berry is very rare and hard to obtain in the Unova regionXY Used to make Pokéblocks that will enhance your Beauty. Its blue flesh is sour when eaten.ORAS
Generation VII
Used to make Pokéblocks that will enhance your Beauty. Its blue flesh is sour when eaten.
A Bluk Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 4 hours, with 1 hour per stage. A Bluk tree will yield 3-6 Berries.
Generation IV
A Bluk Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 8 hours, with 2 hours per stage. A Bluk tree will yield 2-10 Berries.
Generation VII
A Bluk Berry will mature from a planted seed to a full-grown, fruit-bearing tree in 24 hours. A Bluk tree will yield 4-12 Berries.
The Bluk Berry played an important role in Now That's Flower Power!. A Contest expert known as Mr. Big used Bluk Berries in his fireworks displays. However, May's Torchic managed to eat all of its freshly picked Berries, prompting May to search for more. It was also stated in this episode that eating Bluk Berries causes the hair of people and Pokémon to become shinier. Team Rocket overheard this and went in search of some for themselves.
Multiple Bluk Berries, among many other Berries, appeared in Currying Favor and Flavor!, where Ash and Pikachu found them inside a hollowed-out stump in Lush Jungle while looking for a Miracle Seed to be used as a dish ingredient.
The bag description for a Bluk Berry in Pokémon Omega Ruby and Alpha Sapphire state that the Berry is sour. The original Japanese description describes it as 渋い, which was previously translated as dry in the Generation III and IV games.
The Bluk Berry is present in the game data of Pokémon GO, but is unused.