Two exclusive avatar items will be distributed to players of Pokémon GO. A blue T-shirt avatar item will be available via a code that will be announced during a livestream.

Code: WRGUZRVKRR2M3
The code can be redeemed at Niantic's website through August 22nd, 2022, at 11:59 p.m. UTC.

Watch the 2022 Pokémon World Championships to get a Pokémon GO avatar item

Play Pokémon GO in style with two exclusive avatar items celebrating the 2022 Pokémon World Championships in London.

Show off your excitement for the 2022 Pokémon World Championships with a free, event-exclusive T-shirt avatar item! You can claim a blue T-shirt avatar item featuring the 2022 Pokémon World Championships artwork—celebrating the host city, London—by redeeming a code that will be shared via livestream.

Trainers who happen to be attending the 2022 Pokémon World Championships in person will be able to claim a red version of the same T-shirt avatar by spinning the PokéStop at Niantic’s event booth.

Whether you’re attending the event in person or cheering for your favorite Trainers from the comfort of home, you can make sure your Pokémon GO avatar is dressed for the occasion!

Source: https://www.pokemon.com/us/pokemon-news/watch-the-2022-pokemon-world-championships-to-get-a-pokemon-go-avatar-item