In the early days of Pokémon Red, Blue and Yellow, we encountered the bird-trio Articuno, Zapdos and Moltres as well as the Psychic duo Mew and Mewtwo. it was in the late game stage where you grind your Pokémon before actually catching them. The same goes in Gold, Silver and Crystal where we hunt for Raikou, Entei, Suicune, Lugia, Ho-oh and the elusive Celebi.
They were the rarest back then and now in the our present Pokémon GO, they have become more rarer to the point where no one was actually getting one (Articuno appered though, perhaps unofficialy). But their hiding days are almost over as it has been teased to appear in game in some form: developer Niantic announced at its Pokémon Go San Diego Comic Con panel that Legendaries are indeed on its way, but there have been clues in the game, too…
Their absence led people to ask where and when will this legendaries appear. While it is possible that these legendaries will appear at high enough level and enough luck, the trailer suggest that they could be caught through Special Events just like its trailer suggest where players are teaming up to whither down Mewtwo’s health in time square. Easy enough? Everyone gets one.
As for the 2nd gen legendaries, they also appeared in the data-mines showing of their highest base attack in line with Mew and Mewtwo in game– even higher that of Alakazam and Dragonite.
Data-mine reveals that these legendaries have no catch rate which leads us to think that these guys are caught only through an event if not through certain actions in-game.
Mechanics such as these isn’t new to Niantic as they have done it many times in the game Ingress (where Pokémon GO’s map is based on) such as the event “Anomalies” where in teams compete over specific location around the world in the course of several weeks.
Players who participated in the event will be awarded with Emblem and the outcome of the event changed course in the game.
While developers has yet to announce these events in Pokémon GO, in the 2015 Niantic CEO John Hanke, “given the success we’ve had with Ingress [events], it’s a pretty safe bet”.