From October 1st, 2021 until October 3, 2021, at 4:59 p.m. PDT, Rowlet, Litten, and Popplio will be appearing in Pokémon Sword and Pokémon Shield's Max Raid Battles.

Encounter the Alola Region’s Rowlet, Litten, and Popplio in Max Raid Battles

The tropical region’s First Partner Pokémon are chilling out in Pokémon Sword and Pokémon Shield’s Pokémon Dens.

Memories of the tropical Alola region are bound to blow in like a cool island breeze now that the first partner Pokémon discovered there can be found getting cozy in Pokémon Dens across Galar. Until October 3, 2021, at 4:59 p.m. PDT, Rowlet, Litten, and Popplio will be appearing in Pokémon Sword and Pokémon Shield's Max Raid Battles. For an opportunity to encounter these Pokémon in a Max Raid Battle, you'll need to connect your Nintendo Switch system to the internet through Y-Comm or by selecting Mystery Gift in the X menu, then selecting Get the Wild Area News. After that, whenever you see a pillar of light shining from a Pokémon Den, you can walk up to the Pokémon Den and interact with it to start a Max Raid Battle with a Dynamax Pokémon. This event does not affect the Pokémon encountered within Dynamax Adventures.

Be sure to read our Pokémon Sword and Pokémon Shield Max Raid Battle Tips article for advice on how to topple these opponents. Don't wait, though—you don't want to miss out on the chance to add these Pokémon to your team!

Source: https://www.pokemon.com/us/pokemon-news/encounter-the-alola-regions-rowlet-litten-and-popplio-in-max-raid-battles/