A new mode called Catch 'Em Battles is coming to Pokémon UNITE on May 30th, 2022 until June 27th, 2022. Players can battle and catch wild Pokémon and then use them in battle!

YouTube Clip - Harness the power of wild Pokémon in Catch 'Em Battles! | Pokémon UNITE

It's time to harness the power of wild Pokémon! Battle wild Pokémon, catch wild Pokémon and then fight with the wild Pokémon to win the game in the all new Catch 'Em Battles, coming to Pokémon UNITE on May 30!

Sources: https://twitter.com/PokemonUnite/status/1530081771274047488 and https://www.youtube.com/watch?v=6z5RVYdQjso