Nintendo Switch
We're compensated for purchases made through these links. More info.
Read-only feature:
Scan at the monastery's amiibo gazebo to spawn a variety of random items and materials once per in-game month (combined with the generic functionality).
Scan (regardless of the in-game-month limit) to receive character-specific pieces of music, which you can then choose in the options menu during battle.
Sources: Nintendo of Japan, GameXplain (video), Arekkz Gaming (video)
Read-only feature:
Scan at the monastery's amiibo gazebo to spawn a variety of random items and materials once per in-game month (combined with the character-specific functionality).
This feature works with any amiibo (with the possible exception of those that work with its other features).
Sources: Nintendo of Japan, GameXplain (video), Arekkz Gaming (video)