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-Give it a massage in Cyllage City.-Use the Soothing Bag in Super Training.-Give it a Colourful Shake, Rare Soda, Ultra Rare Soda, Perilous Soup, or EV Juices from the Juice Shoppe in Lumiose City.-Use Friendship raising berries. (Grepa, Hondew, Kelpsy, Pomeg, Qualot or Tamato.)-Level up in a battle.-Battle against a Gym Leader, Elite Four member, or the Champion.-Use a Vitamin. (HP Up, Protein, Iron, Calcium, Zinc, Carbos, PP Up, PP Max, or a Rare Candy.)-Walking 128 steps (sometimes).-Use a Battle Item (only works if it has less than 200 happiness)
Doing these things willlowerhappiness:-Letting it faint.-Using Energy Powder, Heal Powder, Energy Root, or a Revival Herb.
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Hope I helped!
Pokémon sun and moon- have malasadas with it, use soothe bell, pet and give beans, or what I like to use, isle avue in poke pelago!