- As soon as Pokémon GO freezes, go to your phone's Settings menu or the fast menu (your Control Center, on iOS) and turn on Airplane Mode.
- Go back to Pokémon GO and close the game.
- Wait until the game says that it has lost its internet connection.
- Restart Pokémon GO.
- Turn off Airplane Mode.
- Check your bag for your newly captured Pokémon.