Use it a bunch and don't let it faint. Also if you catch it with a Luxury Ball it will raise friendships fast. I caught a Pichu with one and after i leveled it up once and then it evolved into Pikachu.
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Keep training your Pokemon. Eventually, as it evolves, it's Friendship/Happiness maxes out.
with high friendship
Woobat---(high friendship)--SwoobatSewaddle---Lv 20---Swadloon---(high friendship)---LeavannyThats about itI got this information from THE OFFICAL UNOVA POKEDEX & GUIDE: VOLUME 2
give it the oval stone when it has high friendship
from Riley he gives you a Riolu egg and you can evolve it at high friendship
Umbreon-High Friendship 8:00pm-3:59am Espeon-High Friendship 4:00am-7:59pm