How do I raise happiness in Pokémon Crystal?

So, I was playing Pokémon Crystal, trying to evolve my Pichu. My only problem is happiness. Is there any way I can up its happiness quicker in Pokémon Crystal?

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In Crystal, you can raise a Pokemon’s happiness in the following ways:Having your Pokemon groomed by the Haircut Brothers in the Goldenrod Tunnel. (amount of friendship gained varies, see my source below)Leveling up anywhere excluding the Pokemon’s met location. (+5 at 0-99 friendship, +3 at 100-199 friendship, +2 at 200-255 friendship)Leveling up at the Pokemon’s met location. (+10 at 0-99 friendship, +6 at 100-199 friendship, +4 at 200-255 friendship)Using a vitamin (HP Up, Protein, Iron, Calcium, and Carbos) (+5 at 0-99 frienship, +3 at 100-199 friendship, +2 at 200-255 friendship)Battling a Gym Leader, member of the Elite Four, the Champion, or Red. (+3 at 0-99 friendship, +2 at 100-199 friendship, +1 at 200-255 friendship.Having Daisy Oak groom your Pokemon. (+3 at 0-199 friendship, +1 at 200-255 friendship)Walking 512 steps. (+1 at any friendship amount)Learning a TM. (+1 at 0-199 friendship, 0 at 200-255 friendship)Using a battle item. (X Attack, X Defend, X Speed, and X Special) (+1 at 0-199 friendship, 0 at 200-255 friendship)

Source