Niantic has revealed a bit more about Trainer Battles coming to Pokémon Go regarding battling team leaders Blanche, Spark, and Candela, who act as practice sparring partners.
The three Team Leaders are available at any time, and you can practice Trainer Battles by going against them if there aren’t any people nearby. The Team Leaders can be fought at different difficulties which vary depending on the chosen Battle League.
Once per day, you can earn a reward by battling against them, such as Stardust and even Sinnoh Stones. Battle wins will also count towards the Ace Trainer medal in Pokémon Go, meaning there are various reasons to face off against the Team Leaders.
Pokemon GO is available for Android and Apple iOS devices.