Buffs are currently available from paid loot boxes. You have a chance at getting one of the following buffs, and is received as an item in your Backpack that you either activate, or sell.
Gives you a small amount of money from Wild Encounters (including from Running)
Gives you more Money from Bounties and Bosses.
Decreases the odds of encountering a non-shiny Pokemon by 20%. This changes your
odds of encountering a Shiny from
Increases EV training.
Increases the exp earned from bounties and bosses.
Increases the exp pokemons gain in battle.