Check out those details below.
Niantic, Inc. and The Pokémon Company International announced that the highly anticipated Trainer Battles feature is now available to Trainers that are level 10 and above. Trainer Battles give players a chance to participate in fast, fun and friendly Pokémon battles with other Trainers.
Niantic has also released a new Developer Insights blog which shares additional details on the creation of the new feature which can be found below and via the following link: https://pokemongolive.com/en/post/trainerbattles-devinsights/