Liko and Roy's adventures in Pokémon Horizons are the result of a unique setup. The duo joins the Rising Volt Tacklers aboard the Brave Asagi airship. One of the airship's most notable features, besides its creative design, is its assortment of guests. It's a haven for Pokémon, who can come and go as they please. The wild Pokémon aboard the ship, despite this freedom, remain the same since the anime's first episode. No one new comes or goes except for Liko and Roy's acquired Pokémon. This means that the Brave Asagi is regularly inhabited by Noctowl, Snorunt, Alolan Muk, Shuckle, Nosepass, Slugma, and Pawmi. Curiously, Pawmi is the only one of these Pokémon that comes from the series' newest region, Paldea.
Source：https://www.cbr.com/pokemon-horizons-theory-liko-catches-pawmi/
