Instructions
Include Togepi in your team roster and use it at least once per battle. Togepi's happiness will increase the more you use it in battle, especially if you use it in important battles like a boss fight or gym leader battle. Likewise, Togepi's happiness increases whenever it gains a level.
Switch Togepi with another Pokemon before it is knocked out during battle. Each time Togepi is knocked out, its happiness score decreases.
Walk around or ride your bike with Togepi in your party. Each step you take will slowly raise Togepi's happiness. Likewise, if you have a PokeWalker, you can transfer Togepi to your PokeWalker and walk around with it in your own life to raise its happiness.
Give Togepi a Soothe Bell as a hold item. The Soothe Bell greatly increases the amount of happiness points that a Pokemon receives when you walk around or ride your bike.
Feed your Togepi vitamins, berries and other Pokemon treats. Togepi's happiness will increase when you give it treats that it likes. Togepi's taste is based on its nature. For example, if you have a Togepi with a bold nature, it will like sour treats, while a modest nature likes dry treats.
Take your Togepi to a massage parlor to pamper it with a massage, which is a quick way to earn a large amount of happiness points at once.