Where do you find black pearls in monster hunter freedom unite

jungle... enter to the left side of the base camp. i think it's map number 2, just walk around the beach near the entrance of map 3. it should be marked by a shell... bring your feline... he'll know where it is cos he'll gather from there when you stand near the beach. then go there and press "o"
you'll get some pretty shellss that worths pokke points but by some luck, you'll get 1 or 2 black pearls...

Daimyo hermitaur would also drop that when you are not detected when you enter the area. it's shiny thing on the floor and shining audio sound would be heard when it is dropped, but most of the time it will drop a crab pearl thingy which worth a lot of pokke points.