Pokémon GO’s community day is June 6th 2021 and with it come a few treats and bonuses:
“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!
Note: Fast TMs and Charged TMs will not grant exclusive moves during Community Day. To learn the exclusive move, you must catch or evolve the featured Pokémon during Community Day hours.”
Community Day allows you as trainer to catch an exclusive shiny Gible.
Make sure to give it a try.