No the happiness only lowers if you give the Pokemon herbal medicine (Revival Herb, Energy Root, Heal Powder, and Energypowder) or if the Pokemon faints in battle.
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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.
You first put 5 of your party Pokemon in your PC Box. Then you have to switch your remaining party Pokemon with another Pokemon from one of your PC Boxes. You have to have at least one Pokemon with you at one time.
Do the same thing you did with someone's pc! Just put move pokemon or deposit your pokemon! :) Hoped this helped!!
in cerulean city in a house next to the PC get pikachu to full happiness and then talk to her
If you already have six Pokemon with you then it will automatically go onto your PC. Otherwise you turn it on by standing in front of it and pressing A. Go into someone's or bebe's PC then deposit your Pokemon by pressing A.