You'll need to make it have High Happiness.
It evolves once in FireRed into Togetic
Whenever the togepi completely likes you it can evolve around level 20. TRICK: Use protein, iron, carbos, zinc, calcium to make togepi like you more.
For a togepi to evolve you need to give it 220 happiness
he hatches
Yes Togepi does evolve in Pokémon SoulSilver. It does evolve, but instead of evolving by levels, it evolves by happiness, which happens in every other Pokemon game with Togepi
yes, togepi does evolve by friendship only
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 have to have high frendship with togepi
When it likes you. This is one of the Pokemon that evolve through friendship.
no, but you can migrate it from other games
Yes, it will evolve through happiness.
to evolve a togepi in Pokemon XD: Gale of Darkness you need to use a lot lot lot of cologne, you kno, the scents.