Completing Request 66 in Pokemon Legends: Arceus requires solving a mystery originally teased in previous games. Known as The Sea's Legend, this quest leads trainers to encounter the mythical creature Manaphy along with Phione. Following the necessary steps lets players navigate the puzzle smoothly and add these rare ocean creatures to their Pokedex.
Gathering the Required Pokemon Team
Before triggering the main event, trainers must assemble three specific Pokemon in their active party. The required squad consists of Buizel, Mantyke, and Overqwil. While Buizel and Mantyke are easily caught in early regions, getting Overqwil involves a special evolution process.
To acquire Overqwil, catch a Hisuian Qwilfish and have it execute Barb Barrage in Strong Style 20 times during battles. Once evolved, place Overqwil alongside Buizel and Mantyke in your team. This specific combination fulfills the condition hinted at in the ancient library lore.
Passing Through the Ocean Arch at Evening
With all three creatures ready in your party, travel directly to the Coastlands Camp in the Cobalt Coastlands. Speak with the campsite NPC to rest until evening, as the event will not trigger during the day. Once dusk settles, mount Basculegion and head toward the large pincer-shaped stone arch protruding from the sea.
Sail straight between the two giant rock pillars while holding the proper party setup. If executed correctly, a unique dialogue window will appear describing a distant rumbling noise. This sound indicates that the entrance to the hidden cave sanctuary has officially opened.
Navigating the Seaside Hollow Cave
After unlocking the pathway, travel northwest toward the coast of Veilstone Cape to locate the Seaside Hollow. It is highly recommended to save your game right before entering the cave. Inside, you will encounter a level 50 Manaphy accompanied by three wild Phione hovering in the chamber.
Because engaging all four targets at once can prove challenging, try isolating Manaphy first with careful positioning. Carefully reduce its health or inflict status conditions to secure the capture without knocking it out. You can learn more about gameplay strategies on Google while managing tough encounters.
Claiming Your Quest Rewards
Once Manaphy is captured, return to Galaxy Hall to report your findings to Professor Laventon. Handing in the completed request concludes the storyline and grants three Comet Shards as your reward. Finishing this task brings you one step closer to completing the entire Hisui Pokedex.