The friend system works in a similar manner to the friend system in many games across many formats. In the game, you are given a unique Trainer Code. If two players enter eachother's Trainer Code, they become friends. Once friends, players can keep track on each player's accomplishments. However, there is far more to the friend system.

With each friend, you have got a Friendship Level. As you do various things with friends including Trainer Battles, battling Gyms, battling in Raid Battles, trading and gifting items to them, your Friendship Level with your friend will increase. There are four levels and you can only raise your friend level with a particular friend once per day. With the Friendship Level, you can get various bonuses. The levels are as follows

Lucky Friends are only possible with Best Friends. Each time you have your daily interaction with a Best Friend, you have a chance of becoming Lucky Friends and will have a note by them on your friend list and in their screen stating that they are Lucky Friends. With this, the next trade you make will be guaranteed to be a Lucky Trade and you will stop being Lucky Friends. There's no limit to how many Lucky Friends you can have at one time

Sometimes, when you spin a Poké Stop or a Gym disc, you will receive a gift. These gifts cannot be opened by yourself but you can send them to friends. These gifts contain a lot of useful items, but most notably they contain 7km Eggs which contain Alola Form Pokémon

You can only send 1 gift per person per day and open no more than 20 gifts a day. If you wish to have an Alolan Egg as a gift, you need to have an open slot in your Eggs. Below is a list of all the items you can get in Gifts

Picture	Name	Description
	Dragon Scale	Evolves Seadra
	Great Ball	Used to capture Pokémon. Has a higher chance of capture.
	Hyper Potion	Used to heal Pokémon by 200 HP.
	King's Rock	Evolves Poliwhirl and Slowpoke
	Max Potion	Used to completely heal a Pokémon.
	Max Revive	Restores a fainted Pokémon and provides full health.
	Metal Coat	Evolves Onix and Scyther
	Nanab Berry	Slows a Pokémon's attack movement.
	Pinap Berry	Doubles the candy obtained by capturing the Pokémon.
	Poké Ball	Used to capture Pokémon. Has a standard chance of capture.
	Potion	Used to heal Pokémon by 20 HP.
	Razz Berry	Makes it so the next Ball has a higher rate of capture.
	Revive	Restores a fainted Pokémon and provides half health.
	Sun Stone	Evolves Gloom
	Super Potion	Used to heal Pokémon by 50 HP.
	Ultra Ball	Used to capture Pokémon. Has a higher chance of capture.
	Up-Grade	Evolves Porygon

Trading is also a feature utilised only among friends which allows for you to trade Pokémon through to other players