Niantic launched the Trainer Battles feature in its Pokémon GO smartphone game on Wednesday.
The game began releasing Pokémon that originally appeared in the Sinnoh region, which debuted in the Pokémon Diamond and Pokémon Pearl games, in October.
The game revealed the all-new Mythical Pokémon Meltan in September, and the Pokémon became obtainable with the release of the Pokémon: Let’s Go, Pikachu! and Pokémon: Let’s Go, Eevee!
Players can use new Protect Shields during Trainer Battles, but only two are available in each battle.