It doesn't evolve by lvl. Train it, and as soon as it loves/trusts you enough, it will evolve, like buneary and pichu. I suggest giving it a sooth bell, so it becomes friendlier quicker, meaning it will evolve sooner.
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it is not necessary to improve its attack or defense i evolved my togepi by only leveling it up it evolved in level 32 in Pokemon leaf green maybe the same fire red don't know
On level 28!!!!
Togepi will evolve once its friendship level is maxed out. Friendship is obtained through numerous ways such as using items like Potions, as well as having Daisy massage the pokemon once every so often. Do not use items that are tagged "bitter" as this decreases friendship.
You have to trade it
Level 55.