In heartgold/soulsilver esp. Chansey
Walk 256 steps with the Pokemon in your active Party. (+1 for all happiness values)
Give the Pokemon Vitamins [HP Up, Carbos, Iron, Protein, Calcium, Zinc, PP Up] (+5 0-99, +3 100-199, +2 200-254)
Usage in Important Battle [Gym Leaders, Elites, Champion] (+3 0-99, +2 100-199, +1 200-254)
Level Up the Pokemon (+5 0-99, +3 100-199, +2 200-254 per level)
The Haircut Brothers in Goldenrod City can raise your Pokemon's happiness between 1 and 10 points depending on your Pokemon's reaction after the haircut
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