Niantic has rolled out new updates to the Pokémon Go app, and for iOS users, you now have the option to play the game at higher frame rates. There's a new option that lets you "unlock your device's native refresh rate for higher FPS." The developer didn't mention the feature specifically in the changelog, so it might fall under the "various quality-of-life improvements" section. You can enable the functionality in the game's advanced settings. It'll show "native refresh rate unlocked" when it's enabled.
The feature is disabled by default, so you'll need to dig in the settings to access it. Before this update, players needed to use workarounds to get Pokémon Go running at 60 frames per second instead of 30fps. With this development, iPhone 13 Pro users can enjoy the game at 120fps. It'll work with older iPhones, but the hardware might not be able to handle it.
Source: Engadget