Stickers are coming Pokémon Go. Stickers were initially discovered that came to Pokémon Go through a datamine, but developer Niantic has formally stepped forward to discuss the upcoming feature. Trainers will now have the ability to add stickers to gifts to send to friends, making it a more personalized exchange than clicking a button and waiting for new items.
When the stickers are available, all trainers will receive a stack of stickers for free. You can use them right before sending a gift to your friend. You can choose which sticker to apply and then when they open it, the sticker will be applied to the front of the gift location. It is adding a bit of charm to the system.
Beyond the cosmetic nature of these stickers, they will not offer any additional services or benefits for placing a gift. Because they're a purely aesthetic addition, trainers won't have to go out of their way to find ways to grow them or add a mountain of them to their inventory. Only five projects will be available when the service starts, but more projects will arrive in the future.
You will be able to purchase these additional sticker designs from the Pokémon Go to shop when they launch. We don't know how much these stickers will cost. They may cost PokéCoins, or you may have to distribute real-world money for them. Given how cosmetic they are, it could be either way. It's a fun addition to the game that doesn't add to another daily routine or new thing that trainers want to use to get more XP or new Pokémon consistently. It is made to be a fun addition to personalizing your gift messages for your Pokémon Go friends.