It was revealed that the next Community Day of the month of July will be focused on the initial of the first generation water type, Squirtle. The event will happen on July 08 (Next Sunday)
Via official Twitter of the game, developers have said that the version of Pokémon with sunglasses will be available for a limited time.
” Attention, Coaches! If you complete field research missions during Community Day, you can find a Squirtle wearing sunglasses. Good luck!”