Do NOT Make the Big Mistake I made… – Friendship Issue in BDSP
Friendship is a stat that is raised through means in and outside of battle, while affection is only obtained in Poke-Amie. You can raise Friendship by Leveling up Pokemon, giving them certain berries, going to the massage person, and many other ways. Affection is obtained by playing/feeding a Pokemon in Poke-Amie.