You can use them in the Parametric Transformer, but that's the only use I know. Not really worth collecting.

Again, another "guide" that does not give 100% accuracy.

Here in Germany we say ich fick deine schwester

Never mind the tsurumi island one uses something else, I take that back.

Guys on tsurumi island in the room with 3 murals, you can open the murals by placing 3 loach pearls.

There are some on watatsumi island

The person claiming that a Hilichurl in the Mimi Tomo event "must be given" a Loach Pearl is a liar, as Magical Crystal Chunk worked just fine.

Comes in handy through the "Mimi Tomo" event. One of the Hilichurls asks for a solid, blue thing (sada lata boya), a Loach Pearl must be given.

What is this? A map for ants?