For a friendship evolution, you would need to raise the pokemon's IQ up to or more than 2 stars. Pokemaster, you do need to go to Luminous Spring to evolve.
May make random appearances every-so-often. Trying to officially return...
POKEMON BLACK FRIEND CODE: 1249-2602-6566
POKEMON BLACK2 FRIEND CODE: 1679-1583-9820
POKEMON Y FRIEND CODE: 3308-5051-2299