The Pokédex is an ever-expanding compendium of all the Pokémon that exist – filling it with complete data is the primary task and ambition of every trainer in Pokémon Go as in all other ...
Alternately, successfully complete your Sinnoh Pokedex by seeing all 150 Sinnoh region Pokemon. Note: They do not have to be captured. Then, go to Professor Rowan’s lab and talk to him.