Instructions
Battle other Pokemon with the Pokemon whose happiness you are trying to raise. Bred as fighters, Pokemon enjoy being used in battle.
Feed your Pokemon lemonade or MooMoo Milk, available at any Poke Shop. Lemonade is cheaper, but MooMoo Milk will also heal your Pokemon.
Travel to Veilstone City, which is marked on your map. Locate the house directly south of the Veilstone Gym. Inside, there is a woman who will give a massage to a single Pokemon of your choice. This can only be performed once every 24 hours.