Hunting Prunelia, the Level 55 Grass/Dark Alpha? You're in the right place. It's a solid farm, and the whole fight comes down to bringing Fire and Dragon and not standing in the wrong spot. Below: exact location, coordinates, weakness, drops, and a fight plan. Here for the coords? First card, right below: -1256, -968.
Prunelia is found at Feybreak Island, near Deserted Ash Plateau, at coordinates -1256, -968. The nearest fast travel point is Deserted Ash Plateau, so you can be on top of it within seconds of unlocking it.
Prunelia is Grass + Dark, so lead with Fire and Dragon damage and you'll carve through its health bar fast. Reliable picks: Arsox, Wixen, Jetragon, Astegon. Pack a bow or firearm too, since poking from outside its attack range beats trading hits up close.
Use the free Palworld Breeding Calculator to see every pair that makes the Pal you want, or what Prunelia can breed into.