Jessie, James and the famous talking Meowth have been present on Niantic's game for some time. By defeating them you get chances to get Dark Ekans (for Jessie) and Dark Koffing (for James).
In addition, it's possible to see them appear in shiny form. But as was said in the press release informing us of their arrival, they will not be available definitively and this is the subject of this news since the month of September will mark the end of their journey within Pokémon GO and its virtual world reflecting our original world.
To be precise, their departure is scheduled for the end of the month, September 30. You only have one month left to have a chance to obtain these creatures from the darkness.
No information on a future return of this trio in the game available but it could very well happen during events related to Team Rocket.
Niantic announced that Victini will be available for all players in September, we detail how to get it on Pokémon GO.
Original content by Donovan"ZeroAk" Plault.