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
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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.
You get a togepi from mr Pokemon then evolve it with friendship to togetic then you use a SHINY stone, not dawn stone, to evolve it xD
For a togepi to evolve you need to give it 220 happiness
When it likes you. This is one of the Pokemon that evolve through friendship.
the egg that hatches into togepi take togepi and let the professer see togepi then he gives you 1