You’ll only have three hours to unlock the move so, that Dratini and Dragonair better evolve pretty fast.
Directly to you from Twitter:
Great news, Trainers! If you're lucky enough to evolve your Dragonair into Dragonite during this month's #PokemonGOCommunityDay, your Dragonite will know a special move—Draco Meteor! pic.twitter.com/7IVPYhYKIq— Pokémon GO (@PokemonGoApp) February 16, 2018
…Wanna play? Buy a 3DS.
That being said, click on Pokémon Go for everything you need to know about the game. 😀