Just go to eldrich zone on crystal isles and look for big bubbles that have some black clams/oysters inside of them, put your angler fish inside the bubble, harvest, and enjoy the best black pearls harvester in the entire game, super easy, rank up for people to see this.
On the new map, Lost Island- there is a sunken ship in the very bottom left corner. I mean, tucked almost right in the corner, where the barriers meet. If you go inside the sunken ship, to the bottom of it, you will find clams full of only black pearls. The devs have a sense of humor, I'll give them that!
When you want black pearls in great quantity, here are some things I suggest.
1: Ragnarok: Vikings bay. Bring a good crossbow to one shot any water scorpions, they drop TONS of black pearls.
2:Extiction: Gachas. Sometimes when taming gachas, you can get one that produces black pearls. They produce in big quantities, and for me is by far the safest and easiest way to get the black pearls. Like if this helps!😄
"This is for only mobile players. Just tame a otter and turn on his/her victim item collection from the corner side of your device and give his/her agreesion to attack target and whistle it to follow you. Then go to small fishes and punch them and wait for some time. Keep warned that your otter's have to kill and hervest that not you. If the otter kill and hervst the fish then it will give you black Pearl. But it has only 35.78% chance to give you black Pearl.This is the tip to get black Pearl safely without any damage. Jay hind
If you’re on ragnarok, go to the sunken ship with a spino that has a couple points into weight and damage , then farm the eurypterids that spawn there for insane black pearls. Since they spawn so often, you can keep going there are get way more black pearls that you’ll need
If on the center you can use the a tueso and it’s grab ability to instantly kill alpha mosasaurs by putting them inside the bubble. The bubble beside the skull has three that spawn right next to the bubble at a high consistency. 100 black pearls each one with gear that comes with it
Neither Gacha, nor kill Tusos. It is best to go to Crystal Isles to the bubbles in the snow area. With an Angler take many black pearls from the shells. It is only necessary to enter with a Basilo to clean the bubbles (in some there are no dangers) and take out the Angler. At x1 he managed to take out 4-5 bubbles 8k black pearls.
You can grind these out by harvesting dead carni flora, use something with a good aoe so you can just stand still and spam click, I got around 150 harvesting 5 groups with a shadowmane. Up so ppl can see.