It doesn't evolve at a specific level in fact you can have a level 6 togetic as long as togepi's happiness is at the max level.
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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
You bring it to level 50
It evolves through happiness
Level it up when it its happiness is full
It needs max loyalty with its trainer you can evolve togepi in one level has long as its happiness with its trainer is at the max.