It looks as though Squirtle will be the featured Pokemon for the forthcoming Pokemon GO Community Day. The event will begin on Sunday the 8th of July at 1pm BST.
“Get out and play together in your local community parks on Pokémon GO Community Day. For just a few hours each month, you can encounter a special Pokémon in the wild. During these hours, there’s a chance to learn a previously unavailable move for that Pokémon or its evolution, as well as earn some Community Day bonuses. Celebrate what it means to be a part of the Pokémon GO community and make new friends along the way!”