Directly to you from Twitter:
Muahahaha! Get your avatar a bad new look! You can now purchase outfits honoring the original Team Rocket or the villainous Team Rainbow Rocket from the Pokémon Ultra Sun and Pokémon Ultra Moon games. #PokemonGO pic.twitter.com/zrQsu3EfpU— Pokémon GO (@PokemonGoApp) February 15, 2018
Source: Pokémon Go App.
…Wanna play? Buy a 3DS.
That being said, click on Pokémon Go for everything you need to know about the game. 😀