https://www.gamespot.com/articles/pokemon-gos-next-community-day-further-detailed-ex/1100-6456838/

Pokemon Go's second Community Day is quickly approaching, and like the inaugural event held last month, it'll give players a brief chance to capture a rare Pokemon with an exclusive move. Developer Niantic had previously revealed that the Pokemon in question this time will be the Dragon-type Dratini, and now the studio has shared details about what its exclusive move will be and how players can learn it.

Dratini will spawn much more frequently for the duration of the Community Day. If players manage to evolve Dratini's evolution, Dragonair, into a Dragonite during the event, it'll learn the ultra-powerful Dragon-type move Draco Meteor. However, it's unclear if the Dratini you capture during the Community Day will still be able to learn Draco Meteor if they're evolved after the event ends; we've reached out for clarification and will update this story with more details.