How do you quickly farm these?

Fish, Thief, rinse repeat

Go out for a nice meal.
They're served as after dinner mints.

Go tothe wailord restaurant in the sealfolk villgae, you can have one oh those for 500 pokedollars and you can repeat this as much as you want

>>30471005
Go to a restaurant, get heart scales.
It takes no effort at all.

>>30471005
>Malie restaurant
>Largest meal
>Get 8 of these for free and have a nice dinner with Nanu

$500 for 1 scale at Seafolk Village Wailord Restuarant
$1040 for 2 scales at Konikoni City's restuarant
$4000 for 4 scales at Malie City's sushi shop

>you eat heart scales now
Why?

>>30471221
also double that once per day if you pick the bottom option

>>30471296
They're a tasty palette cleanser, what did you think the move learner was doing with them?