The official Pokémon website has announced that from September 3rd, 2021 until September 5th, 2021, at 4:59 p.m. PDT, Altaria, Mow Rotom, Cinccino, and Wimpod will be appearing more frequently in Max Raid Battles in Pokémon Sword and Pokémon Shield.

Altaria, Mow Rotom, Cinccino, and Wimpod Come to Max Raid Battles

Clean up with this tidy bunch in Pokémon Sword and Pokémon Shield through September 5.

Until September 5, 2021, at 4:59 p.m. PDT, Altaria, Mow Rotom, Cinccino, and Wimpod will be appearing more frequently in Max Raid Battles in Pokémon Sword and Pokémon Shield. Trainers might even encounter a Shiny Cinccino during this event! What exactly brings this Pokémon assortment together? Well, Mow Rotom could keep any yard in order, Cinccino is known for keeping its space tidy, and Wimpod is known as Nature's Cleaner due to its penchant for eating trash. Galar has never looked so clean!

To encounter these Pokémon in a Max Raid Battle, you'll need to connect your Nintendo Switch system to the internet. Then, whenever you see a pillar of light shining from a Pokémon Den in the Wild Area or elsewhere, you can walk up to the Pokémon Den and interact with it to start a Max Raid Battle with a Dynamax Pokémon.

Get a clean sweep of all four Pokémon while they're appearing more often in Max Raid Battles!

Source: https://www.pokemon.com/us/pokemon-news/altaria-mow-rotom-cinccino-and-wimpod-come-to-max-raid-battles/