How to solve The Sea's Legend in Pokemon Legends: Arceus

Fairly early on in Pokemon Legends: Arceus you'll get a quest - number 66 - called The Sea's Legend from Professor Laventon himself. It's the most difficult to solve in the entire game

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The Sea's Legend - How to Get Manaphy - Pokemon Legends: Arceus Guide - IGN

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Request 66 'The Sea's Legend' and how to get Manaphy in Pokémon Legends Arceus

The Sea's Legend Request Guide - Pokémon Legends: Arceus - Neoseeker

Request 66: The Sea's Legend - List - Requests, Pokémon Legends: Arceus

How to complete The Sea's Legend in Pokemon Legends: Arceus

Request 66: The Sea's Legend - List - Requests, Pokémon Legends: Arceus

Request 66 'The Sea's Legend' and how to get Manaphy in Pokémon Legends Arceus