Well, there's plenty of ways to raise friendship, including, and I'm not joking, just running around with him in your party.
Letting him battle, feeding him berries, interacting with him in the Amie mode (I think), and just spending time with him in your party and moving all raises friendship, so I wouldn't worry too much over it!
It could sell out or just sit until it's brought or something else.
I really want this guide; I'm having major trouble with the game. SOS battles keep happening to me so I can't get my Pichu to evolve; I may just ask someone to trade me a Pikachu. I couldn't care less for EV training; getting happiness up even with Soothe Bell sucks.