That being said while those features are still in the works and scheduled for a release later this year, Niantic has recently announced an upcoming feature that will be debuting this spring in the form of a co-op multiplayer mode. This was revealed according to a blog post on Niantic’s website.
It reads, “We’re still at the beginning of the journey and there’s a lot more to come. With spring arriving in the northern hemisphere, players can look forward to all new cooperative social gameplay experiences in Pokémon GO that will give Trainers new and exciting reasons to get back into the sunshine.”
It is unclear as to what exactly this feature will entail, but it has been suggested that it could be similar to the feature found in Ingress where it will be a raid-like feature. This means that players can work with other players to attack or defend gyms together, as opposed to players doing things on their own. Whether or not this will help the game rebound remains to be seen, but it could still be worth looking forward to.