Usage of the Friend BallA friend ball is used to capture mainly Eevees and other pokemon. When captured, it adds 200+ happiness to the pokemon. It is very useful when dealing with Espeon or Umbreon. You would need a cooked green apricorn, a yellow cooked apricorn, and one red one as well.
How to use
Now, the bad part is it has a fairly-low drive by (no damage) capture. Although, I must've just gotten lucky, but I find it semi-easier to do it with a pigmy. I got a pigmy Eevee with one, so it must've just been luck.