https://www.gamespot.com/articles/pokemon-go-july-community-day-will-feature-squirtl/1100-6460144/

With Pokemon Go's next Community Day is right around the corner, Niantic has shared a few more details about the upcoming event. The featured Pokemon during this month's Community Day will be the classic starter Squirtle, and now we've learned that some players will be able to find a special version of the Pokemon if they complete research quests.

Niantic revealed on Twitter that players who complete Field Research tasks during the Community Day will have a chance of encountering a Squirtle wearing sunglasses--a reference to the Squirtle Squad from the Pokemon anime series. It's unclear whether or not players will need to complete specific quests in order to find a sunglasses-wearing Squirtle, but a new set of Field Research tasks that focus primarily on Pokemon from the Kanto region were recently added to the game.