First you have to go the Five Island, then surf around and look for a man with a beard and brown clothes, then talk to him and you'll get an egg which will hatch into Togepi
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if its the egg you get from the traveler then it becomes a togepi but if you get it from the daycare it will be the Pokemon that you have put together in the daycare
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.
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
Unfortunately, you can't get Togetic in Pokemon Emerald. The only way to have it, is to trade it from FireRed and LeafGreen. But, you can't find Togetic in LeafGreen or FireRed, either. You need to evolve it from Togepi. Hope I helped :)
You can't get Togepi in Pokemon Yellow. Togepi does not exist in that Pokemon generation. (: