Niantic finally confirms the Mossy Lure works for Leafeon and the Glacial Lure for Glaceon in Pokémon GO

Three brand-new items were recently added to Pokémon GO. The Glacial, Mossy and Magnetic Lure Modules are now available in the in-game shop for 200 PokéCoins each. These special items can be used to finally obtain Leafeon, Glaceon, Magnezone and Probopass in Pokémon GO. The Glacial Lure Module can be used to evolve Eevee into Glaceon; the Mossy Lure Module can be used to evolve Eevee into Leafeon; and the Magnetic Lure Module can be activiated to evolve Magneton and Nosepass into Magnezone and Probopass, respectively. For those who have Shiny Eevee, it can evolve into Shiny Leafeon or Shiny Glaceon. Similarly, Shiny Magneton evolves into Shiny Magnezone. The new Lures aren’t the only way to get Leafeon and Glaceon; if you name your Eevee Linnea, it will evolve into Leafeon after using the required amount of Candy. If you name your Eevee Rea, it will evolve into Glaceon instead. This will only work once, so be sure to keep that in mind. Linnea and Rea are both references to Trainers you encounter during the Eevium Z side quest in Pokémon Sun, Moon, Ultra Sun and Ultra Moon.

Source: @PokemonGoApp