A Pokemon loses happiness when it faints, when it's fed bitter medicine, or when it's left in the PC for a really long time.
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with raising the Pokemon with that Pokemon for many time You can raise your Pokemon happiness by defeating many trainers with Pokemon do you want to raise.
Maxing out the happiness of a pokemon is somewhat time consuming. Walking around with the pokemon in the lead position will help slowly increase the happiness. You can also feed the pokemon poffins to help raise stats and happiness.
If you have the happiness App. for your pokewatch thing... you can see how much your Pokemon loves you (how happy they are).
no it doesnt, Pokemon happiness does not go down if it faints anywhere.
In goldenrod, by the bike shop there is a house. Talk to the lady inside. She will say something like: Your Pokemon is still warming up to you (low happiness) Its quite cute (kinda low happiness) Seems to like you a little (kinda high happiness) It really Trusts you (Max happiness)