With the release of the 2nd Gen of Pokémon, the absence of Smeargle and Delibird quite made the stir among players. In simple words, it actually was quite hard to not see these two Pokémon with the rest.
According to Pokémon Go CEO, John Hanke, Smeargle and Delibird were hard to code because of their unique movesets. This, in turn, gives the answer to why they haven’t yet been out in the wild.
A Redditor MichaelTheCactus, explains that Hanke made the above comments while giving a lecture recently. Both of these Gen 2 Pokémon have different moves.
For instance, Smeargle has a move named as Sketch. This particular move lets Smeargle learn the opponents last moves permanently.
Similarly, the Delibird has it’s own special and unique move, Present. The Present move by Delibird allows the trainers to either heal or damage the enemies. In addition, Delibird has an association with the Christmas. So it is possible that the delay in Delibird’s release is due to its reference. It is possible that the Delibird will release with future Christmas event.
According to Hanke, The Legendary Pokémon are being worked on with care, and they will have some limitations at Gyms. Zapdos, Moltres, Mewtwo, Raikou, Entei, Suicune, Lugia, Ho-oh, and Articuno, are the possible upcoming Legendary Pokémon. These Gen1 and Gen2 Legendary Pokémon will speculatively and expectedly release with next Pokémon GO update.
Furthermore, Hanke is said to be so much excited about the upcoming PvP battles as well. This means that the release dates are nearing.