Pokémon Go has a new event all about gen 4 that gives the Pokemon new hats.
The event is meant to coincide with the release of Pokemon Brilliant Diamond and Shining Pearl and will start on November 16th, three days before the release of the new games on November 19th.
The content of the event will see the three Gen 4 starter pokemon Turtwig, Chimchar, and Piplup wearing hats based on the two Gen 4 protagonists Dawn and Lucas.
This was announced on the Japanese Pokemon Go Twitter game:
Nintendo Switchソフト『ポケットモンスター ブリリアントダイヤモンド・シャイニングパール』の発売をお祝いするイベントで、シンオウ地方の素晴らしさを体験しましょう！💎✨
— Pokémon GO Japan (@PokemonGOAppJP) November 9, 2021
The event will be split into two parts. Part 1 will be held from 10:00 on November 16 to 10:00 on November 18 as Part 1, and Part 2 from 10:00 on November 18 to 20:00 on November 21. Many Pokemon associated with Pokemon Brilliant Diamond and Pokémon Shining Pearl will appear in the former and the latter, respectively. The hats of the Gen 4 starters will also change appearance between parts.
In addition, during the event period, eggs placed in the egg incubator and super incubator will hatch at half or one-third the normal rate, and there will also be a collection challenge where you can meet a wild Froslass.
Pokemon Go is available for mobile devices.