Jessie and James are notorious members of the Rocket team of the Pokémon animation show. They are constantly trying to steal the pikachu from Ash Ketchum, among all the other Pokémon who put themselves across their way. Although they have tried several times, they fail constantly and are not the worst people in the world. With the next TEAM Rocket Balloon event on Pokémon Go, could these two characters find their way to the game? New Pokéminers dataminated text suggests that this could happen.
The full text was pushed to Reddit by a member of the PokeMiners team where you can read the full text. While Jessie and James do not have a direct dialogue, some of Team Go Rocket Balloon grunts refer to asking trainers if they saw a pair of crazy, one with blue hair and the other haired magenta. Given the amount of Niantic developers who pushed the balloons for Team Rocket, it is unlikely that these dialogue indices are only references and are probably looking for these two appear as a unique meeting.
When they present themselves left a mystery. At the sound of the disclosed dialogue, Jessie and Jamies could be on the run of Team Rocket and try to engage in their own harmful activities. They could have special shadow pokemon attached to them that players can save, or they could be linked to an event that we do not know. We will know when the Grumbings of the Team Rocket Balloon will arrive on Pokémon GO and hire the players in the dialogue. None of the disclosed dialogs mentions a speaking Miaou, but the fur companion could probably make an appearance alongside these two, even if it is only a pokémon they use in combat.