Earlier this month, Johto region Pokemon encounters were increased in Pokemon GO.
This is going to end on August 28, 2018 at 1pm PDT, so you have a few days left to quickly catch as many Johto Pokemon as possible.
Trainers, with Pokémon originally discovered in the Johto region appearing more frequently until August 28 at 1 P.M. PDT, now is the perfect time to work on your Johto Pokédex! Don't miss it!
— Pokémon GO (@PokemonGoApp) August 23, 2018