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.
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
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!😄
Ragnarok top right of map there’s a sunken ship surrounded by eurypterid they continuously spawn so you can either use a crossbow to kill then harvest with a pick or get a Tuso or something and rack up pearls
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
"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
You can find these easily in the space biome on Genesis 2. Wait until the biome has dark grey/black asteroids with big light green/pink balls floating around (ignore the colour bit cos I kinda forgot what colour they are, but you get the idea) . You should find some little balls on the ground, which you pick up. They will give mostly black pearls and sometimes mutagel.