Instructions
Raise Togepi's happiness by feeding it vitamins such as Zinc and Iron, using it to win Pokemon battles and walking around with it as part of your active Pokemon group.
Check Togepi's happiness by speaking to the Happiness Rater in Goldenrod City while Togepi is in the first position in your Pokemon lineup. Her house is north of the Bike Shop. If the Happiness Rater tells you that "It looks really happy! It must love you a lot!" then your Togepi has reached the maximum happiness rating.
Win Pokemon battles with your Togepi until it gains a level. Upon gaining a new level, your Togepi automatically evolves into Togetic.