This page offers a guide on how to complete Request 31: Setting Up the Bogbound Camp in Pokémon Legends: ARCEUS (PLA).
This request can be picked up from Odo, who’s found near Sludge Mound in Crimson Mirelands. He will ask you to meet him a little north of his initial location to set up a new camp (one you’ll be able to fast travel to!).
How to Beat the 3 Stunky
Before you can set up the camp, you’ll need to defeat 3 that have invaded the area. Stunky are / type Pokémon, which means they take x4 more damage from type Pokémon. For example, if you have a , or an you’ll have a great time! If not, then you may have to cycle through your party as you get beat up by three Stunky! Try to avoid sending out any Pokémon that might be weak to or as they might get one-shot! Anyhow, you shouldn’t have too much difficulty against them as they’re not that strong, so don’t worry too much about tailoring the perfect anti-poison/dark Pokémon party!
Once you’ve defeated them, speak to Odo and he’ll set up the camp. Your reward is that you can now use the camp to rest, swap out Pokémon and fast travel!