On June 26th, 2018, Niantic announced July's research tasks would feature rewards that included Pokemon from the Kanto region(Gen 1). Task rewards include Pokemon such as Pikachu, Ditto, and Eevee.
July's research breakthrough reward will be Body Slam Snorlax. Body Slam is a legacy move that was removed from Snorlax previously.
"Are you ready for more Field Research tasks and helpful rewards for the month of July? On July 1 at 1:00 p.m. PDT, Prepare for a brand-new set of Field Research tasks focusing on Pokemon originally discovered in the Kanto region. Complete these tasks, and you may be able to encounter Pokemon such as Pikachu, Ditto, and Eevee! If you collect enough stamps to earn a Research Breakthrough, you'll have an opportunity to catch a Snorlax that knows Body Slam. Don't forget: If you haven't caught the Legendary Ice- and Flying-type Pokemon Articuno, work toward a Research Breakthrough this week before it goes away. So get ready for a fun mix of tasks next month, and GO!"