You can fly an argent into the skeleton dino waterfall cave on ragnarok (argents spawn on the cliff above that cave) and you can grab the precious bean in its beak and then kill fish to feed it without it running around. Only coelacanths and salmon spawn in the cave. Near the path between the mud hill and the metal plains on ragnarok there’s a lake full of coelacanths that you can use attack whistles for Pearl harvesting! Hope this helps.