Summon your tiny tatsunoko minion. If the Hingan word for sea horse is tatsunoko, would that make this a sea pony? *Your* little sea pony?
A single ilm to the right or left and this cute creature would have been kebab. Fate, however, intervened, and now the wavekin follows its would-be transfixer─the tiny tyke having taken quite well to the upper world's drier climes.
How to obtain:
Gathering -- Gathered by Fisher
Deep Dungeon -- Heaven-on-High - Gold Sack
Island Sanctuary -- Sanctuary Materiel Container
Cosmic Exploration -- Bronze Ancient Record - Oizys or Auxesia