Pokémon Go on Apple Watch allows trainers to receive notifications right on their wrists about nearby Pokémon PokéStops, eggs and medals.
You can also collect goodies from PokéStops, log each gameplay session as workout this counts toward your Apple Watch Activity rings. It displays the distance traveled toward hatching an egg and receiving Candy for Buddy Pokémon.
But you can't actually catch Pokémon on the Watch.
Look out for a Santa-hat-wearing Pikachu that's only available to find and catch through December 29th.