This page offers a guide on how to complete Request 45: Shellos of the East and West in Pokémon Legends: ARCEUS (PLA).
Before you can access this request, you’ll need to complete Anthe’s first request, Request 24: Inspiration from Hippopotas. After completing her initial request, you can speak to her again and this time she’ll ask you to show her the two different forms of the Shellos.
Where to Find Shellos (West Coast) in ARCEUS
Where to Find Shellos (East Coast) in ARCEUS
The West Coast form of the Shellos (blue form) can be found in Cobalt Coastlands. You can find a fair few near Seagrass Haven. They’re a higher level than the pink Shellos in Obsidian Fieldlands, but you shouldn’t have too much of an issue if you have appropriately levelled Pokémon.